Works Triplestar Aluminum Rear Sprockets — 520 Street Conversion — are constructed of high-quality, aerospace-grade 7075 T-6 aluminum for extreme lightweight. These sprockets utilize the same exclusive tooth-valley design as Sunstar’s off-road aluminum product, which provides 24% more chain contact area for the best power transfer possible. Sunstar claims this sprocket gets more hard-anodized coating than any other aluminum sprocket on the street market for added durability and a superb finish, increasing lifespan by about 15% in comparison to other brands. Finally computer-designed weight reduction holes lighten things up even more in this $69.96 sprocket. See Sunstar online at www.sunstar-mc.com or call (937) 743-9049.