Classic Sunstar design with Blue color anodized 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 Sunstar 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. Classic Sunstar design with Black color anodized 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 Sunstar 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. Recommended for use with Powerdrive drive sprockets and 520XTG Works TripleGuard sealed off-road chains.