Avid B64 carbon gearbox shims
Coming from Avid and made for the Team Associated B64 range of vehicles are three new carbon fibre gearbox shims. They allow to raise the gearbox to the desired height which ultimately provides more grip to that end. Avid developed these to provide racers with the ability get the the popular 2mm version on their own, the fine tuning of the 0.5mm/1.0mm shim separately, or the whole kit of all three for all out adjustability.
Source: Avid [avidrc.com]