ARKSEN 407-Piece Rubber O-Ring Assortment Kit - 32 SAE Sizes Seal/Gasket Engine + Case Perfect for sealing gasket, plumbing, hydraulic, air/gas connections A wide assortment of universal SAE sizes, O-rings provide a secure seal for oil, air, gas and water applications Size: SAE Standard Pliable rings are made of flexible rubber to seal contact and connection points Complete with secure-fit latched storage case that keeps each O-ring size separate