SPI, 09-609, 2 Piston Kits Arctic Cat ZR600, ZL600, Mountain Cat 600, Pantera 600 & Powder Special 600 Standard Bore 78mm 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