HPI Racing stock replacement bevel gear set is constructed of steel. This product includes two large bevel gears, two small bevel gears and one gear pin.
Outer diameter of large gear: 19mm (0.75")
Outer diameter of small gear: 12mm (0.47")
Pin length: 27mm (1.07")
Pin diameter: 4mm (0.16")
Nothing. This is a direct replacement gear set.