Saber tooth grooves; unique tooth design increases sprocket longevity. Available in four colors (in most sizes) with contrasting silver machine cuts. Vortex patented sprocket design is unlike any other sprocket. Note: Image is for representation only; act 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. Lightweight CAT5 aluminum racing sprocket. 100% CNC manufactured in the U.S.A. Specially formulated alloy per Vortex specifications.