This is the stock Spur Gear for the HPI E-Firestorm. FEATURES: Sturdy black composite design Precision molding to insure accurate mesh YOU WILL RECEIVE: One 87 Tooth 84 Pitch spur gear SPECIFICATIONS: Inner diameter: 5mm (0.20") Outer diameter: 47mm (1.85") Teeth: 87 Pitch: 48 lmm 01.04.09 ir/jxs &