The MotoSport.com Renthal Chain & Sprocket Kit includes ONE Steel Countershaft (Front) Sprocket, ONE Aluminum Rear Sprocket, and your choice of ONE Premium Drive Chain, each with the following features: Sprockets / Chainwheels Included: When looking to replace your sprockets, Renthal sprockets are an easy choice because of their strength and inexpensive price tag. Renthal Front Sprocket: Also known as "chainwheels", Renthal front sprockets are precision manufactured to withstand the rigors of Supercross, motocross, and enduro racing. Renthal Front Sprockets are made out of 655M13 nickel-chrome-molybdenum alloy steel. What does that mean to you? Ultimate strength and hardness. Self-cleaning mud grooves prevent the build-up of dirt.