Novak 5201 Mod 0.6 Aluminum Pinion Gear Set, 14T/15T/16T FEATURES: Designed to fit the non-standard 1/8 diameter motor shaft used on Novak Three-80 Micro Pro Brushless Motors included in the Mongoose Brush INCLUDES: One each 14, 15 and 16 tooth pinion gears, three 3x3mm set screws REQUIRES: Installing on motor shaft