High Quality Made of high quality iron as well as aluminum cap. It is not only strong enough, but also resistant to high temperature and wear and tear. Good Sealing Performance The one-piece structure ensures a tight seal between the piston and the cylinder wall. It can effectively prevent the gas in the cylinder from escaping into the crankcase. There are two precision fittings in the package, which can be installed in the head and tail to connect the gas pipe and ensure good air tightness. High Power It has a large displacement that can explode a lot of power.