The Freudenberg-NOK N903X O-Ring, with a diameter of 4.975 inches and a cross-section of 0.210 inches, is made from high-quality 90 durometer NBR (Nitrile Butadiene Rubber). This O-Ring is designed to provide a reliable seal in various applications, particularly in hydraulic and pneumatic systems. Its excellent resistance to oils and fuels ensures longevity and performance, meeting stringent industry standards for sealing solutions. Ideal for use in demanding environments, the N903X is a trusted choice for professionals.