This listing is for 50 piece/s.HNBR O-Rings, also known as Highly Saturated Nitrile (HSN), is a synthetic polymer produced from the hydrogenation of Nitrile, resulting in varying degrees of saturation of the polymeric chain, along with a range of enhanced physical strength and chemical resistance properties. Features HNBR O-Rings are ideal for mechanically demanding applications. Heat and Chemical resistant. Ideal for all oil resistant applications, including exposure to such oil additives as detergents, anti-oxidants and anti-wear agents. Exposure to oil soured with metal sludge. Seals for oil well applications. Seals for automotive fuel handling systems. Seals for general industrial usage. Pack of 50