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The Vertex Top End Piston Kit For Yamaha/Fantic YZ/WR125 2005-2021, XX125 2021, XE125 2021-2022 53.94MM 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: VTK23119B.