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 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 72.00mm Pistons are single ring design, dual ring design for same models also available Fits 2003 Ski-Doo Summit 600HO Adrenaline 2004 Ski-Doo Summit 600HO 2005 Ski-Doo Summit 600HO Adrenaline 2006 Ski-Doo Summit 600HO Adrenaline SDI 2007 Ski-Doo Summit 600HO Adrenaline SDI 2008 Ski-Doo Summit 600HO Adrenaline SDI 2009 Ski-Doo Summit 600HO Everest ETEC 2009 Ski-Doo Summit 600HO X ETEC 2010 Ski-Doo Summit 600HO Everest ETEC 2010 Ski-Doo Summit 600HO X ETEC 2011 Ski-Doo Summit 600HO Everest ETEC 2011 Ski-Doo Summit 600HO X ETEC 2012 Ski-Doo Summit 600HO SP ETEC 2013 Ski-Doo Summit 600HO SP ETEC 2014 Ski-Doo Summit 600HO SP ETEC 2015 Ski-Doo Summit 600HO SP ETEC