Manufactured by Kit includes piston, rings, pin, clips, wrist pin bearing top end gasket kit (you get exactly what is pictured) Cast piston has super-high silicone content for additional strength Piston skirts are Molybdenum Teflon coated to minimize resistance/wear and provide extended life Piston dome is anodized for superior heat resistance and longer lifespan gaskets use performance materials to increase durability and provide greater reliability Includes all gaskets pictured to rebuild top end Kit is for standard bore size – 80.00mm Piston is 79.95mm Compatible with Polaris models below: 1990 Trail Boss 350L 2×4 1990 Trail Boss 350L 4×4 1991 Trail Boss 350L 2×4 1991 Trail Boss 350L 4×4 1992 Trail Boss 350L 2×4 1992 Trail Boss 350L 4×4 1993 350L 2×4 1993 350L 4×4 1993 350L 6×6 1993 Sportsman 400 4×4