These are Optional Rear Bearing Carriers for the TRA Electric Rustler, Stampede and Bandit. The rear axles fit into these bearing carriers. Black nylon construction Two rear bearing (hub) carriers Two RPM decals (4) 5x11mm bearings, if needed use (2) DTXC1547. Height: 40mm (1.58") Width at widest point: 15.4mm (0.61") cmc 03/17/02 ir/kh &