Aluminum ball-differential set for XRAY T2�008, T2'009, T3 made of special Swiss 7075 T6 aluminum components for high strength and durability. Features heat-treated and hardcoated aluminum output Shafts, screw for external adjustment, tough composite 34T and also 38T diff pulley with Labyrinth Dust Covers�, high-performance ball-bearings, high-quality carbide Axial thrustbearing, heavy-duty diff washers, and carbide diff balls. Factory pre-assembled.