The product is a 54T rear drive sprocket designed for Yamaha dirtbikes from the years 2000-2001, specifically made by Moose Racing. This sprocket, with the manufacturer part number 5FC-25454-20-00, is a crucial component for optimal performance and durability in dirtbike racing. It is designed to provide a reliable and efficient power transfer from the engine to the rear wheel, ensuring smooth and consistent acceleration, making it an essential part for any Yamaha TTR-125 dirtbike enthusiast looking to upgrade or repair their vehicle.