Each Belt is Crafted from Only the Best Rubber Compounds and Tough Aramax Cord Belts Enhance the Efficiency of the Variable Speed Drive System Eliminates Excessive Friction and Tension Preventing Drive Damage Outer Circumference: 37″ / Top Width: 1-19/64″ Compatibility: 2003 Yamaha 660 Grizzly 4×4 ATV Drive Belt Each Belt is Crafted from Only the Best Rubber Compounds and Tough Aramax Cord Belts Enhance the Efficiency of the Variable Speed Drive System Eliminates Excessive Friction and Tension Preventing Drive Damage Outer Circumference: 37″ / Top Width: 1-19/64″ Compatibility: 2003 Yamaha 660 Grizzly 4×4