Manufactured by Namura Kit includes piston, rings, pin, clips you get exactly what is pictured Cast piston has super-high silicone content for additional strength Piston skirts are Molybdenium Teflon coated to minimize resistance/wear and provide extended life Piston dome is anodized for superior heat resistance and longer lifespan Kit is for .020 over bore size 87.50mm Piston is 87.43mm Made in Taiwan Fits Polaris 850 models 2009 Polaris Sportsman 850 XP 2009 Polaris Sportsman 850 XP EPS 2010 Polaris Sportsman 850 Touring EPS 2010 Polaris Sportsman 850 XP 2010 Polaris Sportsman 850 XP EPS 2011 Polaris Sportsman 850 Forest 2011 Polaris Sportsman 850 Touring EPS 2011 Polaris Sportsman 850 XP 2011 Polaris Sportsman 850 XP EPS 2011 Polaris Sportsman 850 X2 2012 Polaris Sportsman 850 Forest 2012 Polaris Sportsman 850 Touring EPS 2012 Polaris Sportsman 850 XP 2012 Polaris Sportsman 850 XP EPS 2013 Polaris Scrambler 850 XP HO EPS 2013 Polaris Sportsman 850 Forest 2013 Polaris Sportsman 850 Touring HO EPS 2013 Polaris Sportsman 850 XP 2013 Polaris Sportsman 850 XP HO EPS 2014 Polaris Scrambler 850 XP HO EPS 2014 Polaris Sportsman 850 Forest 2014 Polaris Sportsman 850 Touring HO EPS 2014 Polaris Sportsman 850 WV 2014 Polaris Sportsman 850 XP HO EPS ***2 Pistons are required for these machines***