TrackballsKensington Expert Mouse Wired Trackball K64325
A wired USB symmetrical trackball with a 55 mm ball, a scroll ring and 4 buttons, supplied with a detachable wrist rest.
~$87.65
5z6p Instruments knot-c
The knot-c is a wired index-finger trackball with a 34mm ball, four physical buttons and two touch buttons, designed to sit between the halves of a split keyboard.
Key specs auto-matched against source pages · Last verified: 2026-10-17
~¥9,500
Where to buy
No US retailer found yet. Official site
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Pros
- QMK/Vial support allows buttons and scrolling to be customized
- Sold pre-assembled; no soldering required
- 3D-printed case files are open source
- Compact body suits placement between split keyboard halves
Cons
- 34mm ball and USB cable are not included
- USB wired only; no wireless
- 3D-printed case may show layer lines, scratches or paint flaws
- Listed as out of stock on BOOTH
Specs
| Handedness | Ambidextrous |
|---|---|
| Ball size | 34 mm |
| Ball position | Center |
| Buttons | 4 |
| Scroll | Ball |
| Weight | — |
| Connectivity | USB |
| OS | windows, macos, linux |
| Released | 2026 |
AD · detail-mid
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