The MotoSport.com JT 520 Aluminum Sprocket And Chain Kit includes ONE JT Steel Front Sprocket, ONE JT Aluminum Rear Sprocket, and your choice of ONE Premium Drive Chain, each with the following features: Sprockets / Chainwheels Included: JT Steel Front Sprocket: JT Steel Sprockets are manufactured using the latest generation of computer design and control metal cutting equipment and only the finest grade of SCM420 chromoly steel alloy. The JT Steel Sprockets range now contains over 2,500 parts for all motorcycles and ATVs. Made exclusively from the finest high carbon steel. Outlasts any mild steel or surface hardened sprocket.