This is the 87 tooth Spur Gear made by Kimbrough for use on the Associated RC10B4 buggy. FEATURES: Plastic construction Black in color INCLUDES: One 87 tooth spur gear REQUIRES: Attaching to the RC10B4 buggy SPECS: Outer Diameter: 47mm (1.85") Inner Diameter: 4.8mm (.189") Teeth count: 87 teeth COMMENTS: For use with the RC10B4 high torque capacity, double sided slipper. NNA 4/15/03 ir/jxs