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Works Triplestar Aluminum rear sprocket - featuring hard anodized coating for extra strength & durability. Classic Sunstar 'works' finish, made from 7075-T6 aerospace grade aluminum for light weight with mud grooves at the base of the tooth area on the front side only. Together with our exclusive tooth-valley design, this allows for up to 50% more chain roller contact area, leading to longer life out of your drive components. Used by championship level riders & teams for over 25 years & counting.