... Professional manufacturer 2. Sintered piston for shock absorber 3. PTFE band is made and assembled in-house by auto machine Product ... , including powder metallurgy piston, rod guide, foot valve, PTFE band for piston, Du bearing for rod guide. 5. PPAP III ... Du bearing, and piston with PTFE. Du bearing and PTFE band are made in-house also. Measuringdevices1. Carbon selfur determinator2. Metallurgic ...