This is the 48 Pitch 18 Tooth Pinion Gear from Arrma. FEATURES: Hardened steel construction Stock replacement pinion gear for the Arrma Vortex, Granite, Fury and Mojave Optional for the Arrma Raider and ADX-10 INCLUDES: 48 Pitch 18 Tooth Pinion Gear with Set Screw jxs 11/09/11 ir/jxs