Regina Chain OE Chain and Sprocket Kit 7ZRD/118KSU031 Economical kits come with precut chain and front and rear sprockets Chain is Reginas high-performance 520 Z-ring series with gold outer plates and Z sealing rings, which dramatically improves performance and wear life; includes clip-type masterlink Sprockets are made of high-quality steel and have OEM gearing Chain: 525ZRD Gearing: 15/47