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

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

Billiard Ball Sizes

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.

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

Crystal/Quartz/Healing 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. Be sure to look for size discrepancies in buyer comments.
rose quartz 1.25 inch sphere ball-s
Buy at amazon
purple crystal ball 40mm 24581
40mm Asian Rare Natural Quartz Magic Crystal Healing Ball Sphere Purple Buy at amazon

Note: these may not be machine made, so, may not be perfectly round and may not fit well.

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.

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

• 42 mm marbles. Buy at amazon

• 42 mm marble Buy at amazon

• 35mm marble Buy at amazon


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

Inche to Millimeter Conversion Table

Trackball Physical Sizes Comparison


Trackball Sizes Comparison