DID PBR Chain Kit 520VX3 15 45 Standard Standard Rear Sprocket Made of 7075 Ergal aluminum Made of 7075 Ergal aluminum a durable standard steel sprocket and the high quality 520XMR3 chain Pin Length: 0 Chain 520VX3: The VX Series chain is a great chain upgrade from OEM and is our most popular and widely used chain on both on and off road bikes