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 72.00mm Fits 600 Carbureted Race Sled 2013 Ski-Doo MXZ X 600RS REV-XP RS 2014 Ski-Doo MXZ X 600RS REV-XS RS 2015 Ski-Doo MXZ 600RS REV-XS RS 2016 Ski-Doo MXZ 600RS REV-XS RS