Manufactured by SPI Includes 2 pistons, ring sets, wrist pins, circlips, bearings fix kit 2 base gaskets, aluminum spacer, 8 extra long cylinder bolts and 2 dowel alignment pins 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 85.00mm ***Dual ring design pistons*** Fits 2008 Polaris 800 Dragon RMK 155 2008 Polaris 800 Dragon RMK 163 2008 Polaris 800 IQ 2009 Polaris 800 Assault RMK 146 2009 Polaris 800 Dragon RMK 155 2009 Polaris 800 Dragon RMK 163 2009 Polaris 800 Dragon SP 2009 Polaris 800 Dragon Switchback 2009 Polaris 800 IQ 2009 Polaris 800 RMK 155 2009 Polaris 800 RMK Shift 144 2009 Polaris 800 Switchback