These are optional pinion gears for the Avante and Avante 2001 kits. FEATURES: They are 48 pitch metric and are 18 tooth and 19 tooth. The number of ofteeth is stamped on the pinion so they cannot be confused which is which. They are made of aluminum. YOU WILL RECEIVE: 1- 48P metric, 18T pinion gear 1- 48P metric, 19T pinion gear 2- set screws WAJ 11/21/93 &