This 13 tooth Pinion Gear is an official HPI part that is machined from high strength steel to preci... | This 14 tooth Pinion Gear is an official HPI part that is machined from high strength hardened steel... | This 16 tooth Pinion Gear is an official HPI part that is machined from high strength hardened steel... | This 17 tooth Pinion Gear is an official HPI part that is machined from high strength hardened steel... | This 18 tooth Pinion Gear is an official HPI part that is machined from high strength hardened steel... |