Lot of 2 ….4 x 8 x 3mm blue sealed ball bearings
|4 x 8 x 3mm||2|
Also called 840 size by Tamiya.(4mm inner,8mm outer 3mm wide)
Ball bearings should always be your first upgrades; that reduce
friction for less rolling resistance, and that means higher speed and
longer the running times.
Buy it now is for 2 (TWO) bearings.