The MotoSport.com Vortex 525 CAT5 Sprocket And Chain Kit includes ONE Steel Countershaft (Front) Sprocket, ONE CAT5 Rear Sprocket, and your choice of ONE Premium 525 Drive Chain, each with the following features: Sprockets / Chainwheels Included: Vortex Front Steel Sprocket: Made of the highest quality steel. Case hardened. Drilled lightening holes on most applications. Vortex CAT5 Rear Sprocket: Utilizes the same Vortex design with a color anodizing that excludes sweeps, mud grooves and teeth. The result is a bright flash of color in red, blue, gold or black (available colors vary by bike model) with bright silver highlights. Cat 5 anodized. 100% CNC machined. Vortex patent pending design.