Lightweight CAT5 aluminum racing sprocket. 100% CNC manufactured in the U.S.A. Specially formulated alloy per Vortex specifications. Saber tooth grooves; unique tooth design increases sprocket longevity. Vortex patented sprocket design is different than any other sprocket.; ; 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