N20 Ball Caster Wheel MINI 3PI This MINI 3PI N20 Ball Caster Wheel consists of four small balls and a diameter of 12mm large steel ball, all the steel ball with 304 stainless steel ball, to ensure long-term use will not rust, the outer ring material is plastic, suitable for smart car chassis Support and desktop miniature robots above. The caster wheel makes the robot to walk or move at a more flexible and comfortable way. Package Includes : 1 x N20 Ball Caster Wheel MINI 3PI
