Associated Electronics 91461 B5 Gear Diff Kit Black, brown and grey in color Composed of durable material Compatible with the RC10B5, RC10B5M, and the RC10SC5M team kits. FEATURES: Replaces stock carbide ball type differential 52T, 48P diff gear INCLUDES: Complete Gear Differential Kit REQUIRES: Silicone Diff Fluid, 3000wt recommended, ASCC8052 joss 06/12/14 ir/joss