The MotoSport.com Mika Metals Chain & Sprocket Kit includes ONE Steel Countershaft (Front) Sprocket, ONE Rear Sprocket, and your choice of ONE Premium Drive Chain, each with the following features: Sprockets / Chainwheels Included: Mika Metals Front Sprocket: Mika sprockets are made of the highest quality steel to withstand the rigors of off-road racing. Hardened steel for ultra-long lasting wear. High quality replacement for you stock sprocket. Self-cleaning grooves to improve sprocket life. Tooth design allows for increased power transfer. Drilled (certain applications) for light weight. Mika Metals Rear Sprocket: Mika sprockets are made of the highest quality aluminum to withstand the rigors of off-road racing. Lightweight. Designed to be lightweight but durable for even the worst conditions.