Rear SprocketCNC-machined from a specially enhanced 7075-T6 aluminum alloyMachined self-cleaning mud grooves at each tooth to help prevent mud buildup and increase wear resistanceUltralight design is 66% lighter than steel, yet incredibly durable#1 sprocket used in supercross, motocross and offroad throughout the worldTEETH: 53 COLOR: Green PITCH: 520 POSITION: Rear Product Name: Sprocket MATERIAL: Aluminum Units: Each