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Cycloid HD (Glass-filled)

Regular price $95.00 USD
Regular price Sale price $95.00 USD
Sale Sold out
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  • The Cycloid HD (Heavy Duty) is the most premium Zippy flipper available. Known in some circles as "The Douglas," the Cycloid HD is the heavier, more durable, and more rigid older brother to the Cycloid v2. The Cyloid HD is made from glass-filled nylon and features channel-construction handles. The total weight of the Cycloid HD is 2.728 oz. The Cycloid HD still offers the same adjustable balance (with a more homogenous weight distribution due to the higher-density nylon), threadlocker-free tuning, and performance bearing system as the regular Cycloid. Please note that the texture of the Nylon handles is very distinct, and feels like 3000 grit sandpaper, and that some Cycloid HD's have cosmetic blackening on the sides of the interior tang pins (as shown in image 5).

    Full Cycloid v2 Changelog

    Balance Adjustment Instructions Video

    Specs at a glance: 2.728 oz, Glass-filled Nylon, channel construction, tang pins, threadlocker-free racewasher/bearing pivots.

    (1) Zippy's are the original balisong where the bearings rotate in two precision-grooved race washers: produces a pivot system with unrivaled axial stability and smoothness.

    (2) Threadlocker-free double-nylock hardware tuning system keeps the Cycloid lockup tight without messing around with threadlocker.

    (3) Adjustable balance: Choose between nearly unlimited balance profiles by adding or removing Tungsten weights in both the blade and handles. The Cycloid balance profile can be adjusted to be blade biased, neutral, handle biased, and everything inbetween.

    (4) Unrivaled durability among plastic balisongs: made of the engineering thermoplastic Glass-filled Nylon PA12, the Cycloid HD offers impressive rigidity and durability.

    (5) Hybrid channel/extension spacer handle design featuring tang pins for fantastic sound and the best durability of any plastic balisong.

    (6) Positive Jimping for extra grip on ladders.

    Please note that the Cycloid HD is not compatible with Zippy Slim, Weight, or LED Caps.

    I'm a one-man operation making Cycloid's as fast as I can. While I typically ship out orders within a few days, please allow up to 3 weeks for me to manufacture and ship your Cycloid. Thank you for your patience and support.

Customer Reviews

Based on 2 reviews
burlap nutsack
I dig Doug

(All of the positive things in my review of the v2 apply here as well) Honestly, when I ordered the HD after already owning a v2, I wondered if I made a bad decision. I did not. You’re probably thinking “okay so it’s just a cycloid with added weight. Big deal” which would lead to my disappointment when it arrived, right? Wrong. It is heavier, it is a cycloid, …and it is a big deal. This thing is rugged. Gritty. Powerful. I pulled out the zippy pouch and immediately noticed it was heavier than I expected it to be. The handles have a very fine sandpaper feel to them… which I feel gives a bit of grip. This material tends to chip or dent, but doesn’t take damage easily. The chip/dent quality of the material is reminiscent of metal balisongs and gives your cycloid some character over time. Now, this is a cycloid… and flips most like the cycloid v2… but also isn’t similar enough to justify me owning only one of the two. Zippy completely rebalanced the HD after making the v2. It’s not just extra weight thrown at the tip of the blade and ends of the handles, it’s a whole rebalanced cycloid. The HD is like a baseball bat with the practice swing weights on it. …or piccolo with his hat and cape on still. I have trouble with the HD after flipping the v2 for too long, much like when you try to flip metal after flipping plastic a lot. Also, going from the HD to metal flipping is a breeze comparatively. On paper the weight is not a substantial difference, but in practice it absolutely is. I carry this bali every day since I got it and full recommend it. HD vs v2 will come down to your preference though- HD has more rugged handles, only tanto blade, less handle design, and is half-chanwiched (eliminating the creek noise.) If you’re unsure between this and the v2 (and can only get one,) I say Douglas is your man.

Nothing quite like it out there!

The best way to describe the aesthetic when you hold it is like an ancient ceremonial knife, with shaping and patterns Ive never seen on a Balisong. The color options are fantastic as well, like all Zippy products. Performance wise, the weight and balance are perfect! And if the balance doesnt fit your taste, you can experiment with the weight configuration! Overall its got a nice reliable and unique feel to it, and its definitely my favorite in terms of aesthetic and customizability.

Product Information


Weight: 2.728 oz
Balance: Nearly unlimited customizable balance configurations
Handle length: 5.8 in
Open length: 10.375 in
Thickness: 0.53 in with vertical taper
Pivot system: Caged Bearings on dual hardened race washers
Blade stop: Tang pins
Ergonomics: Chamfered handles, rounded blade spine + positive jimping
Blade style: Tanto
Material: Glass-Filled Nylon PA12 blade, Polyurethane spacers
Latch: None

International shipping

International Shipping

Zippy ships international, but the buyer accepts the risk for lost, damaged, or seized packages-it is the customer's responsibility to comply with all local laws and regulations when importing and using this product. It is the customer's responsibilities to be aware of all import requirements when ordering, including but not limited to paying customs/import/duty fees. All international customers: it is your responsibility to looking up your country's customs requirements when you order to ensure you are in compliance, and interface with your country's customs and pay all associated fees if necessary.

For EU customers, be advised that customs will apply a VAT fee of approximately 30€ for importing products that exceed 100€. This is subject to change depending on up-to-date EU regulations; it is the customer's responsibility to verify this at the time of your purchase.

For questions and concerns (looking at you, Aussies), please contact me at If the Zippy is shipped in 2 packages, you will need to assemble the trainer following these instructions:

Zipper Assembly

Cycloid Assembly

My package hasn't arrived, or my package is lost; what should I do?

Noooooo! Don't panic yet. So far I've never actually had a package get lost in the mail, although delays with USPS aren't unheard of, especially if the shipping is international. If you're a US-customer and your package is lost in the mail, appears lost in the mail, or was marked delivered but wasn't actually delivered, call the USPS immediately (1-800-275-8777)**. The faster they get on the case, the more likely you'll reach a timely resolution and get your Zippy ASAP. You can email me about it, but once I ship it out, I don't have access to any additional information that you don't--I'm just going to refer you to call the shipping carrier for resolution.

**Some tips when calling USPS:
(1) Do not use speakerphone, as this will confuse the automated system.
(2) From the automated menu, say "Package," and follow the prompts with your tracking number.
(3) When it offers "visual mode," I recommend you use it. It's faster and more streamlined.
(4) At the end of the automated system which will track your (delayed) package, say "agent" or "representative" so you can speak to an agent and explain the issue.
(5) Sometimes they only allow the sender to open an investigation. If that's the case, shoot me an email asking for the shipping label, and then use the return address information on the shipping label to provide the sender information.

If you are an international customer and your package hasn't arrived yet, contact your local postal service that interfaces with USPS to evaluate the situation--worst case scenario you may need to reach out to customs to see if your package made it through or was seized. It is the customer's responsibility to comply with all local laws and regulations when importing my products.

Hopefully your package is just delayed (this has always been the case historically when a package appears lost), but if it is actually lost in the mail, I'm very sorry. Believe it or not, it's just as heartbreaking for me as it is for you, since I make every balisong myself and put a lot of love into each one. Unfortunately, I am unable to take responsibility for packages that get lost in the mail (or seized by customs). I offer a variety of shipping options which have different levels of pricing and reliability/risk, and it's up to you to choose what is best for you. I am unable to replace lost packages for free, since each product takes me a considerable amount of time and financial investment to make; I'm not a big Amazon company that manufactures their stuff overseas. Thank you for understanding.

Warranty & Returns


If part of the Zippy breaks within 1 year of purchase and it affects functionality, I will replace it for free. Contact me at

In order to qualify for this policy, the issue must affect the function of the balisong. Normal wear and tear (including scratches and dings caused by repeated impact) is not covered by this warranty unless it affects the functionality of the balisong or I determine it to be the result of a manufacturing defect. In order to reduce cost for the customer, the Diode is not covered under the Zippy Warranty. Replacement Diode parts can be purchased here.

Worn M2 x 0.4mm nylock nuts are consumables and should be replaced from time to time if you disassemble frequently--these are not covered by the warranty.

Returns & Order Cancellation

I do not accept returns or refunds. All orders are final. Packages that are delayed or lost in the mail are not my responsibility. Many of my products are made-to-order and by the time you contact me to cancel, I may have already begun working on your parts. I am a one-man operation and returns are far too time consuming and costly to deal with. I appreciate you supporting my small business.


By using this website and/or purchasing any Zippy Balisong LLC products from this website or other sources, you agree to abide by all of the following terms and conditions:


Zippy Balisong LLC modifications are aftermarket mods that the customer installs themselves. The mods do not include a knife or trainer, and it is the customer's responsibility to follow the assembly instructions (listed on each product page) when installing the aftermarket Zippy mods. If you have any questions during the assembly process whatsoever, do not hesitate to contact me for clarification ( Improper installation can lead to property damage and injury, and the onus is on the customer to abide by safe practices when assembling and using these products--any injuries or damage to the customer's knife/trainer or other property during the assembly process or use of the balisong is the responsibility of the customer. Balisongs (whether trainers or knives with a sharp edge) carry inherent risks, and it is the customer's responsibility to operate all Zippy-modded balisongs in a safe and responsible manner to themselves, and everyone around them, including pets and property. To ensure safety, the customer must verify proper hardware tightness (including threadlock and installation), structural integrity of the balisong and all installed mods, and function of the balisong and all modifications prior to each use. It is the customer's responsibility to read the entire product description for each Zippy product they use to ensure they are using the product within recommended guidelines (for example, per the product desccription: the ZippyLucha should not be used at a functional work knife or manipulated over hard surfaces such as concrete). It is the customer's responsibility to comply with all international, federal, and local laws and regulations when importing and using these products.

Zippers, Cycloids, and Diode's are not real knives. These products are balisong trainers, not real knives. The blades are made of plastic, weighted with tungsten. This is not a weapon or a cutting tool and is used for recreation and training only. It is the customer's responsibility to comply with all international, federal, and local laws and regulations when importing and using these products.

You agree to not copy, modify, creative derivate works of, or reverse engineer, in whole, or in part, for any purpose: Zippy's website, products, and intellectual property, including concepts, prototypes, all products, designs, text, and photographs.

Privacy Policy

When purchasing products, you agree to provide accurate information (name, contact method such as email, address, credit/debit card information, and other information. Zippy Balisong LLC reserves the right to request identification following payment to verify your identity and prevent fraud. Zippy Balisong LLC will not sell your personal information to third parties. Zippy Balisong LLC will not share your personal information with third parties without your permission except in response to inquiries by law enforcement and government agencies, or if I have reason to believe your use of the website and purchase of products is for an unlawful purpose. These cases that do not require your consent to share data consist of: court order, a subpoena, legal process, governmental request, or to investigate fraud.

How do I maintain my Zippy?

For disassembly, tuning, and balance adjustment information, please see the Maintenance guide. All Zippy Balisongs ship with weights installed, but are easily adjustable for whichever balance profile you prefer.

What does the Balisong ship with?

Cycloids arrive assembled and fully tuned. They include:
-A Zippy sticker.
-A pouch for the balisong.
-An L-key Hex tool for disassembly and tuning.