Manufactured by SPI Includes 2 pistons, ring sets, wrist pins, circlips as pictured SPI pistons are engineered to provide the best possible path for combustion chamber heat transfer to the cylinder walls All SPI pistons, rings, pins, circlips are manufactured to OEM specifications All individual components are interchangeable with original parts Piston weight is compatible with original piston T-Moly series with Teflon-Molybdenum coating T-Moly series pistons reduce friction, resist seizure, improve durability Made in Taiwan Pistons are for standard bore size 77.25mm Fits 2010 Polaris 600 Pro-Ride Rush CFI 2011 Polaris 600 Rush 2011 Polaris 600 Rush LX 2011 Polaris 600 Rush Pro-R 2012 Polaris 600 Rush 2012 Polaris 600 Rush Pro-R