Manufactured by SPI. Made in Taiwan 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 Pistons are for standard bore size 82.00mm ***Pistons are dual ring design, single ring pistons also available*** Compatible with Ski-Doo models below: 2008 GSX 800R LTD PTEK 2008 MXZ 800R Adrenaline PTEK 2008 MXZ 800R Renegade PTEK 2008 MXZ 800R Renegade X PTEK 2008 MXZ 800R X PTEK 2008 Summit 800R Everest PTEK 2008 Summit 800R X PTEK 2009 MXZ 800R Adrenaline PTEK 2009 MXZ 800R Renegade PTEK 2009 MXZ 800R Renegade X PTEK 2009 MXZ 800R X PTEK 2009 Summit 800R Everest PTEK 2009 Summit 800R Hillclimb PTEK 2009 Summit 800R X PTEK 2010 MXZ 800R Adrenaline PTEK 2010 MXZ 800R X ETEC 2010 MXZ 800R X PTEK 2010 MXZ 800R XRS PTEK 2010 Renegade 800R Adrenaline PTEK 2010 Renegade 800R Backcountry PTEK 2010 Renegade 800R Backcountry X PTEK 2010 Renegade 800R X PTEK 2010 Summit 800R Everest PTEK 2010 Summit 800R Hillclimb PTEK 2010 Summit 800R X PTEK 2011 MXZ 800R TNT ETEC 2011 MXZ 800R TNT PTEK 2011 MXZ 800R X ETEC 2011 MXZ 800R XRS ETEC 2011 Renegade 800R Adrenaline ETEC 2011 Renegade 800R Adrenaline PTEK 2011 Renegade 800R Backcountry ETEC 2011 Renegade 800R Backcountry PTEK 2011 Renegade 800R Backcountry X ETEC 2011 Renegade 800R SP PTEK 2011 Renegade 800R X ETEC 2011 Summit 800R Everest ETEC 2011 Summit 800R Everest PTEK 2011 Summit 800R Freeride ETEC 38.4 Ski Stance 2011 Summit 800R Freeride ETEC 40.1 Ski Stance 2011 Summit 800R SP PTEK 2011 Summit 800R X ETEC