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The Vertex Top End Piston Kit For KTM/Husqvarna/Gas Gas SX/TC250 2017-2022, EXC/TPI/TE250 2017-2023, MC/EC250 2021-2023 66.35MM is part of the latest collection from Vertex. . Features: . All pistons are heat-treated with a T-5 hardening and tempering cycle . All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life . Cast piston kits are gravity-cast aluminum alloy with 18% silicone content, which produces an extremely light but very strong piston . Top end piston kits include piston, rings, wrist pin, circlips and top end gaskets . Manufacturer part number: VTK23630B-2 .