Porsche 100mm cylinders/pistons are made of aluminum and NIKSICA®. This cylinder/piston set is designed for high performance application for the real Porsche enthusiasts. The aluminum cylinder has a higher heat conductivity than cast iron liners, while the nikasil coating allows the cylinders and pistons to work against each other with reduced friction.The surface of the cylinders is CNC machined for smooth operation. The structure of cylinders is designed to enhance the heat-resistance and durability. This set includes 6x cylinders, 6x pistons, 6x piston rings/pins/clips.