The MotoSport.com Supersprox 525 Stealth Sprocket And Chain Kit includes ONE Supersprox Front Sprocket, ONE Supersprox Stealth Rear Sprocket, and your choice of ONE Premium Drive Chain, each with the following features: Sprockets / Chainwheels Included: Supersprox Front Sprocket: Supersprox offers a full range of sprockets for most modern motorcycles. Supersprox sprockets last longer, saving on running costs for your motorcycle. Made from SCM-435 case-hardened steel for extended life. The refined core structure ensures that the teeth will not break when worn, unlike cheap C-45 sprockets. Grooves and lightening holes for off-road bikes / lightening holes for street bikes.