Vortex 520 Steel Rear Sprocket Kawasaki Made of the high carbon steel for maximum strength. Features: 100 CNC machined Saber tooth grooved Vortex patent pending design Carbon steel construction Laser cut Durable satin finish Longer lasting than aluminum sprockets Weight saving cut outs Now available in black hardcoat (Ptfe), proven to last up to 30 longer Note: Sprocket shape and size will vary depending on model, picture is for reference only. Designed for 520 size OEM replacements or suitable conversions to 520 size chain and sprockets