Trackball Ball Sizes and Replacement

By Xah Lee. Date: . Last updated: .

Where to Buy Replacement Balls?

Sometimes you can buy replacement balls designed for the device, but typically they are way expensive and not worth it.

Logitech M570 trackball replacement ball (34 mm). Buy at amazon

trackball ball 34mm
trackball ball 34mm Buy at amazon
Logitech Trackman Marble replacement ball-s
40 mm balls for trackball. Buy at amazon

K9 Crystal Balls

longwin 40mm crystal ball 04197
Buy longwin 40mm crystal ball

“K9 crystal” is a type of high-tech glass. Light weight, and good optical property (e.g. no bubbles inside).

Note: it may not track well. I have not tried.

longwin 50mm crystal ball 89352
50mm ball. Buy longwin 50mm crystal ball

This is designed for trackball, but very expensive.

electric ice rgb trackball
Translucent ball, designed for LED modification. (So color lights makes the ball glow evenly. Not transparent balls.) http://groovygamegear.com/webstore/index.php?main_page=product_info&products_id=273

Billiard Balls

pool table balls
American-style pool table balls. 57.15 mm (2 1/4 inches) billiard balls

The American-style pool ball, at 57.15 mm (2 1/4 inches), is the most easy to find.

Here's other standard pool table ball sizes:

You'll also find mini 1 3/8 inch (34.925mm) ones.

Crystal/Quartz Balls

Few things to be aware:

  1. Heavy ball may wear down the ceramic bearings in the trackball socket.
  2. Clear glass or polished surface may not track well.
  3. The advertised size is often inaccurate. Check buyer comments.
  4. May not be perfectly round.
rose quartz 1.25 inch sphere ball-s
Size ~35 mm to 40 mm. Buy at amazon
purple crystal ball 40mm 24581
40mm Asian Rare Natural Quartz Magic Crystal Healing Ball Sphere Purple Buy at amazon
Kensington Orbit Trackball scroll ring quartz ball-s
Lighting effect with a quartz ball, more beatiful than can be captured by a photo. 〔image source reddit
Kensington Orbit Trackball scroll ring ball 64446-s
ball of Kensington Orbit Trackball with Scroll Ring
quartz ball 68851-s
quartz ball.

Large Marbles

marble size chart 70321 jff
〔image source https://www.moonmarble.com/

Some large marbles will work for smaller trackballs.

Note that marbles may not come in exact size, may not be perfectly round, may have scars.

• 35mm marble Buy at amazon

• 42 mm marbles. Buy at amazon

• 42 mm marble Buy at amazon

• Jumbo 2 inche (~50mm) marbles but actually ~44.45mm. Buy at amazon

on amazon, search for “big marbles” big marbles

Inche to Millimeter Conversion Table

Trackball Physical Sizes Comparison


Trackball Sizes Comparison