Made of the high carbon steel for maximum strength.; 100% CNC machined; Saber tooth grooved Vortex patent pending design Electrically coated for a b 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; Note: Designed for 520 size OEM replacements or suitable conversions to 520 size chain and sprockets