Niche 2127 is a new Cylinder, Piston, Gasket, Head Top End Kit and has everything you need to rebuild your Top End including: Cylinder, Piston, Piston Rings, Wristpin, Cirlips, Head and Base Gaskets, Head Cover Gasket, Chain Tensioner Gasket, O-Ring and NGK Spark Plug. Also included is a Cylinder Head and Cylinder Head Cover. Simply install your existing valves, springs, and rocker arms and go! If you're in need of new Cylinder Head internals we do offer these separately. The Cylinder is aluminum with an oversized steel sleeve that has been built to the original Honda specifications. All Kit components are manufactured to the same size and standards as your originals and are engineered to exceed stock standard performance. When your Top End rebuild Kit arrives, your parts are ready to install. Quality and Performance guaranteed!