Manufactured by SPI Includes 3 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 64.00mm Fits 1992 Polaris 580 XLT SP 1993 Polaris 580 XLT 1993 Polaris 580 XLT SKS 1993 Polaris 580 XLT SP 1994 Polaris 580 XLT 1994 Polaris 580 XLT SKS 1994 Polaris 580 XLT SP