Manufactured by SPI Includes 2 pistons, ring sets, wrist pins, circlips, bearings 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 Gasket kit 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 78.00mm Fits 1998 Ski-Doo Summit X 670 HO 1999 Ski-Doo MXZ 670 HO 1999 Ski-Doo Summit X 670 HO