Description:

• These wheels produced by handmade in best quality.
• PERFECT for wood dohyo (non-magnetic) sumo robot projects.
• Outside diameter is 52 mm, thickness is 30mm. 
• Center hole is 6mm, so it fits to all 6mm shaft diameter motors.
• Inside aluminum rim is processed at CNC lathes.
• Each wheel's weight is 48 grams. Better for 2 wheeled and 4 wheeled sumo robots. Also suitable for explorer style robots.
• It has an M4 set screw inside, so It holds motor's shaft mechanically and firmly.