Manufactured by SPI Dual ring piston design 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 2013 Ski-Doo Tundra Xtreme 600 HO ETEC 2014 Ski-Doo Tundra Xtreme 600 HO ETEC 2015 Ski-Doo Tundra Xtreme 600 HO ETEC