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Knucklebone - Modular (components)

Name: Knucklebone - Modular (components)
Brand: Aroundsquare
Availability: InStock

$16.00–$60.00

Fidgets & Coins

Available when checked

Last observed: 2026-10-23 12:18 UTC. Check the selected seller for current availability.

First listed 8mo ago

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About Knucklebone - Modular (components)

Modular Knucklebone

Please read:

If you're looking for the modular delrin knucklebones, you'll find them under a separate listing. The parts are compatible with those listed below.
Grip sections and knob pairs are listed and sold separately. For a full setup, be sure to include a grip as well as a pair of knobs
There are noticeable machining lines on the machine finished pieces, especially the titanium regular knobs and honey knobs. They are not uncomfortable but they are perceptible. Please be aware of this before purchasing

The Modular Knucklebone is Aroundsquare’s mix-and-match knuckle roller system, with assorted grip sections and end grips, players can build their own kbone setup based on their shape, size, and weight preferences. Use the drop down menu to select the components you want (click “purchase” then navigate back in your browser to continue shopping and add more to your cart").

At this time, we are offering three different grip sections, all sand-blasted (because it gives you the smoothest play), and all sporting the “a r o u n d s q u a r e” word mark (because legit, right). Details are as follows:

Titanium (regular length) in sandblasted or machine finished natty, and also in sandblasted with PVD coatings (shinobi/ black or sunset/ multicolour): 10.3g (reg $25)
Titanium “+5” grip (5mm longer than regular, sandblasted): 12g (reg $27.5)
Titanium Slim grip (2mm thinner than regular): 9g (reg $25)
Aluminum (regular length, all colours are sandblasted): 6.5g (reg $15)
Aluminum “+5” grip (5mm longer than regular, sandblasted): 7.5g (reg $17.5)
Ultem (regular length without logo) : ~3g (reg $20)
Delrin (regular length, all colours) : ~3.32g

As for end knobs, each has their own feel, and will resonate with the preferences of different players. Details as follows:

Original style titanium (machine finished): 33.0g per pair (reg $50 for natty or $55 for PVD coated)
Barrel style titanium (machine finished): 22.0g per pair (reg $50)
Original style copper (machine finished): 63.5g per pair (reg $40)
Original style brass (machine finished): 60g per pair (reg $40)
Original style stainless (machine finished): 55.7g per pair (reg $35)
Original style aluminum (sandblasted): 19.5g per pair (reg $25)
Original style Delrin (all colours): 5.15 per single
Honeybone style titanium (machine finished): 22.8g per pair, and makes a great set of begleri in addition to kbone knobs (reg $55 for natty or $60 for PVD coated)
Honeybone style aluminum (polished): 14g per pair, and makes a great set of begleri in addition to kbone knobs (reg $30-$35)
Honeybone style brass (machine finished): 42.8g per pair; drilled out and can be used as begleri, although quite heavy to sling (reg $45)
Honeybone style copper (machine finished): 45.6g per pair (reg $45)
Skinnybone style titanium (polished): 19.1g per pair; drilled out and can be used as begleri (reg $45)
Skinnybone style brass (machine finished): 35.2g per pair; drilled out and can be used as begleri, although quite heavy (reg $30)
Skinnybone style copper (machine finished): 36.8g per pair; drilled out and can be used as begleri, although quite heavy ($35)

The modular Knucklebones are designed to provide great play experience. The sandblasted grip sections provide smooth, low friction contact for smooth rolling between the fingers. The glossy end knobs provide good grip for manipulating the ends of the toy and preventing drops, and regardless of your metal choices, the contrasting finish creates an slick look that will develop nicely over time.

In general, the heavier ends relative to the middle grip provide a weight distribution which facilitates some aspects of play, while lighter ends make for a lighter assembly overall, which is preferable for some tricks and some players. While there is a lot of personal preference involved, the slimmer profile of the skinnybone style knobs may be harder for some players to work with, and may slip through the fingers and drop more easily than the wider standard knobs. Each model has its own pros and cons, as well as its own overall look and feel.

General Info on the Kbone

AO2's Knucklebone is the original hardbody knuckle roller. This is a simple skill toy that is manipulated with the fingers of one or both hands to perform tricks and patterns, or simply to pass the time. It is very discrete (unless dropped) and can be played in very restricted spaces, and in contexts where other showier skill toys may not be appropriate. There are tutorials already available online at the AO2 YouTube channel, and we’ll be publishing more in the coming weeks to help get folks started.

The weight and hard material mean it will make a loud noise when it is dropped on hard surfaces, and has the potential to break things in its path. Be careful with it. Some metals are relatively soft, and will still show scratches and dings on the drop portions (see photo with original prototype for reference).. it falls with weight, so it hits concrete hard.

Note from the designer: I developed the original knucklebone circa 1989 when I was a kid in school. The crude original version was made from some kind of polymer clay (see photo). The new version is better suited to bigger hands, and has been designed for smoother flow and better trick potential.

Warnings: Metal versions are heavy and solid--can break things or hurt things if dropped. It is recommended that you play over carpet, couch, or the like, or outside. Delrin versions look almost tasty, so keep them away from young kids, and don't let anyone try to ingest them.

For more information on Aroundsquare's Kbones, visit the Knucklebone product page.

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Aroundsquare$16.00 USD

Knucklebone - Modular (components) · Grip - Regular Al Natty Sandblasted

New · Available when checked

Last observed: 10/23/2026, 12:18:36 PM UTC

Knucklebone - Modular (components)

About Knucklebone - Modular (components)

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Knucklebone - Modular (components)

About Knucklebone - Modular (components)

Best Titanium Fidget Spinners of 2026

Compare configurations and sellers

B/S/T Listings

Price history

Frequently asked questions

How much does the Knucklebone - Modular (components) cost?

Where can I buy the Knucklebone - Modular (components)?