Manufactured by SPI Includes 3 pistons, ring sets, wrist pins, circlips, full gasket kit 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 Complete Engine Gasket Set Contains all gaskets pictured to rebuild an engine, including oil seals with stainless steel springs for maximum performance and corrosion resistance. Made in Taiwan Pistons are for standard bore size 70.50mm Fits 1997 2003 Ski-Doo 800 Mach Z 1999 2000 Ski-Doo 800 Formula III 1999 2001 Ski-Doo 800 Grand Touring