Brand New Race-Driven Chain and Sprocket Kit. You will receive 1 - 520-96L blue non o ring chain, 1 - 15 tooth front steel sprocket and 1 - 40 tooth rear steel sprocket to replace the chain and sprockets on the following: 2001 2002 2003 2004 2005 Yamaha YFM660 660 Raptor. Race-Driven Steel Sprockets are made from S45C Steel and are manufactured to meet or exceed OEM specifications. Race-Driven branded chain has a tensile strength in excess of 7600 lbs. All chains include a masterlink, these chains are designed for the casual - recreational rider. Race-Driven offers different qualities of chain, we have our basic non-o-ring chain and o-ring chain, make sure when purchasing a chain you do so according to your riding style. Race-Driven is committed to bringing the highest quality products to all riders at an affordable price. Customer Driven – Quality Driven – Race-Driven.