All standard O-Ring Sizes (imperial and metric) are available in Sillicone, Viton, Nitrile, EPDM, Neoprene, FEP Encapsulated and Solid PTFE. These 'O'Rings are manufactured on a Hydraulic press with tightly controlled temperature and time for ensure accurate dimensions, excellent finish, invisible flash line, properly post cured and absolutely defect free. We can also supply encapsulated o-rings where one materials covered with a continuous layer of another material.