Team Losi Rear Gearbox Bearing Inserts, Aluminum 8B/8T 2.0 High-durability aluminum allows inserts to be used for the life of the vehicle Hard anodized to improve durability and be resistant against scratching Left- and right-side inserts key into gearbox to disallow any rotation of the inserts that can cause drivetrain failure Laser-etching identification designates inserts for 2.0 gearboxes only .1 and .25mm shims included for differential shimming