Cylinder Kit Big Bore 21010-K01Big Bore Cylinder KitCylinder kit includes matching Vertex pistons to ensure longevity, performance and reduced engine noise Cylinders have a nickel silicon carbide cylinder sleeve Look virtually identical to OEM cylinders Kit includes cylinder, pistons, rings, pin, clips and gaskets Made in the USA Cylinder does not require machine work (unless noted). Kit Includes: Cylinder Piston Kit Top End Gasket Kit