Manufactured by SPI & Made in Taiwan Includes 2 pistons, ring sets, wrist pins & circlips as pictured All individual components are interchangeable with original parts T-Moly series with Teflon-Molybdenum coating Pistons are for standard bore size 65.00mm Compatible with Ski-Doo models below: 1999 MXZ X 440 Liquid Cooled (453cc engine) 2000 MXZ X 440 Liquid Cooled (453cc engine) 2001 MXZ X 440 Liquid Cooled (453cc engine) 2002 MXZ X 440 Liquid Cooled (453cc engine) 2003 MXZ X 440 Liquid Cooled (453cc engine) 2004 MXZ X 440 Racing Liquid Cooled (453cc engine) 2005 MXZ X 440 Racing Liquid Cooled (453cc engine) 2006 MXZ X 440 Racing Liquid Cooled (453cc engine) 2007 MXZ X 440 Racing Liquid Cooled (453cc engine)