Material: Aluminum and Steel Cooling: Air-cooled Displacement: 49cc Bore Type: Standard Bore Piston Diameter: 15mm Pin Diameter: 10mm The kit is constructed from aluminum and steel to support heat dissipation and.It includes a cylinder, piston, rings, pin, clips, and an end gasket set, offering a complete solution for rebuilding the end of your engine. The cylinder features an aluminum exterior with an internal cast iron liner to enhance cooling and performance.Its standard bore design with a 37mm bore diameter and 15mm piston pin compatibility with various 50cc engines.Built to meet specifications, the kit supports engine function after rebuild.Gaskets are made from resilient materials to extend service intervals.This assembly is intended as a direct replacement for worn or damaged components, restoring engine efficiency and power output. Disclaimer: This is an aftermarket spare part.Trademarks are used only to specify compatible devices.