Do not send us an email or note specifying what length chain you need. You must ORDER the correct length. BUYER must check chain length needed before ordering. Any info provided by seller regarding stock length is to the best of our knowledge, but seller is NOT responsible for chain that is ordered incorrectly. Any return for different length chain will be at buyer's expense, including shipping both ways. PLEASE check BEFORE ordering. This brand new blue o-ring chain sprocket kit will give your ATV better acceleration and fits the following models 2001 2005 Yamaha Raptor 660 YFM660R Included is blue o-ring chain chain may need to be cut to length 1 Master link clip style 1 12 tooth front sprocket 1 40 tooth rear sprocket Tensile strength of 8200 pounds Factory Spec brand Stock gearing for these models is 13/40 with a 92L chain O-ring style means it will last longer with less maintenance than conventional chains Our sprockets are made of hardened steel and built to last Be sure to check the tensile strength of any chain you buy. Low tensile strength chain will stretch and need to be replaced. Other length chains are available. Buy with confidence from Forward Powersports where we specialize in quality powersports parts and accessories.