Hot Racing 40 tooth, 1.0 Mod spur gear for the Traxxas Revo 3.3 and Slayer Pro 4x4 features: - CNC Machined and hardened steel construction - upgrades factory plastic gear - Super heavy Duty 1.0 Mod pitch - black oxide coating for durability and corrosion resistance - blue anodized countersunk washers you will receive: - one (1) 40 tooth 1.0 Mod spur gear - three (3) mounting screws - three (3) blue anodized countersunk washers requirements: - hardened steel clutch bell with 1.0 Mod pitch - Best use a hardened clutch bell like the Hot Racing Srvo412 (12T), Srvo413 (13T), or Srvo414 (14T) specifications: - number of teeth: 40 - gear pitch: 1.0 Module - mounting holes: 3 - tooth face Width: 6mm comments: - Compatible With the Traxxas Revo 3.3 and Slayer Pro 4x4