The Sunstar Rear Sprocket 37T 31K-Y37-20R is a high-quality steel sprocket designed for motorcycles such as the RZ350 and SRX600. Made in Japan, this sprocket is compatible with a 520 chain pitch and is the perfect replacement part for models ranging from 1983 to 1995. With 37 teeth and a durable construction, this rear sprocket ensures smooth and reliable performance for your bike's transmission and drivetrain system. Upgrade your motorcycle with this trusted and reliable part from Sunstar.