ESCW Zero Friction Piston Kit for VSR-10The zero friction for VSR10 is characterized by a Delrin body, a plastic material with excellent mechanical properties, strong and light and with a very low surface roughness, only RA of 1. 2. The spiral milling, performed on the entire surface, gives the kit created a breathtaking appearance while at the same time reducing the contact surface between piston and cylinder; this design choice also favors the retention of the lubrication grease ensuring