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The Vertex Top End Piston Kit For Yamaha YZF250 2014-2015, WRF250 2015-2017 COMPR 13,5:1 76.96MM 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 . For 4 Stroke Engines: Complete Piston Kit, Top End Gasket Kit & Cam Chain..Manufacturer part number: VTKTC23941B.