Pololu ボールキャスタ（3/4 inch 金属ボール入り）

Great caster at first, but on 10 days of indoor use on hardwood floors and carpet with very minimal weight (shares load with two other wheels - the load being an arduino, a pair of 3v motors and battery pack) the plastic caster holder starts to wear and will not keep the caster in its original spot of relatively fluid movement.

Amazing ball caster, so easy to use!

Ballcaster of perfect dimensions of a robot base diameter of 200mm: is provided with two supports / spacers to be easily used with wheel diameter slightly large. (translated from Italian with Google Translate)

nice

I used it to replace the swivel caster on my small robot !