This is a complete bearing kit for the 3D Printable RC Tank by designer Andre Klaus aka Staind on Thingiverse.
Bearing kits come with all of the bearings required to build the tank with the 540 motors OR the X2212 motors and we include 1 extra bearing of each size for you just in case. Specifically our kit includes:
5 - 4x12x4mm (604 2RS) bearings
25 - 8x22x7 (608 2RS) bearings