Knuckle

Three components, three different actions

MTAK × BTMCL’s GAMER-TAK makes the distinction clear: it has a plate described as push-flickable, four contact buttons and a simulated joystick. Identify each part, then distinguish sliding the plate, pressing a button and moving the joystick. Four buttons do not automatically mean four distinct play modes, and the parts need not move together.

Game-controller styling is not a game console

GAMER-TAK uses circuit-board elements in a resin plate, with separately specified buttons and joystick. These are physical fidget components and a decorative design; a visible circuit board does not establish that the object can run electronic games. A still image also cannot establish sound levels or simultaneous operation.

Single-finger, two-finger and multi-finger

The guide groups documented bodies as single-finger, two-finger or multi-finger. WM explicitly describes WARM as single-finger; WANWU describes Behemoth as a two-hole knuckle; MISTY explicitly describes PrimeMover 2.0 as a four-finger design, placing it within multi-finger forms. “Full-palm” is not automatically a synonym for “four-finger.” If the body is not identified clearly, its subgroup remains unspecified.

Two visible holes may have different purposes

A hole's purpose matters more than the total count. One specific MTAFK announcement describes two lanyard holes, rather than two finger openings. That wording does not establish a two-finger body. Finger openings, lanyard holes and decorative openings must be distinguished; a similar outline also does not turn a pendant into a knuckle.

Rollers can be independent fidgets

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AMMO's March 2026 zirconium Mechanical Decoder announcement describes an independently usable roller with two selectable feedback styles: distinct detents and dense feedback. Those features belong to this roller and version. They are not automatically default features of a compatible body, nor evidence for a different magnetic version.

Read “detents” as individually distinguishable feedback steps, and “dense” as a closely spaced sequence of feedback. These are word meanings, not measurements of this roller; no shared density threshold across products is established here.

Flipping panels: identify the moving piece

MTAK's FUSION F-01 illustration names the body, shell and flipping panel as separate components. The flipping panel is the moving fidget part; the word “plate” alone does not establish that a part flips. The maker mentions magnets and a washer-bearing arrangement, along with a sound description. These are version-specific design statements, not a sound-level comparison or an audio demonstration.

One-piece and separate-plate construction

ACEdc × OneBean's original Cheese Knuckle announcement distinguishes two versions. Its one-piece version uses one material throughout; its separate-plate version has a body and plates joined mechanically without adhesive. For this model, “separate plate” describes construction. It does not establish tool-free removal or compatibility with plates from other products.

A separate-looking plate may be permanently bonded

Rainbow Coffee CHEERS provides a useful counterexample. It has a titanium body and plates made with coffee particles and resin, but the maker explicitly states that these comparatively fragile plates are permanently bonded with resin adhesive. Compare it with the separate-plate Cheese version: having a plate does not, by itself, mean that the plate is replaceable or movable.

A material belongs to a named part

The FUSION F-01 specification illustration separates its titanium body and shell from its zirconium flipping panel. Rainbow Coffee CHEERS similarly distinguishes the titanium body, resin plates and CERAKOTE finish. A zirconium panel does not make the whole body zirconium, and a surface finish is separate from the body's material.

A pendant derivative has its own identity

MTAK explicitly presents CHEERS 60% as a pendant scaled from the one-piece CHEERS design, illustrating necklace, bag-charm and lanyard-charm uses. Its identity is a pendant derived from CHEERS; the source design's knuckle or bottle-opening functions do not automatically carry over. The percentage also does not replace actual dimensions for the pendant.

Three questions to keep with each record

First identify the object: a complete body, a component or an independent derivative. Next identify its generation, material and construction version. Finally check whether a feature belongs to that object or only appears on a compatible object or in an illustration. The original Cheese announcement also says that inlays were not a factory configuration at that time; an inlay photograph is not proof of a series-wide standard.