This is the Differential Gear Maintenance Set from Arrma. FEATURES: Hardened steel construction Fits the Arrma Raider, Fury, ADX-10, Vortex, Granite, and Mojave INCLUDES: Three Bevel Gears, One Gear Pin, two Outdrive Pins, four Spacers and two O-Rings jxs 11/09/11 ir/jxs