Rubber o-ring 1) Materials: NBR, BR, FPM, NR,SBR 2) Characteristics: high/low temperature-resistant, wearing-resistant, waterproof 3) Specifications: a) State standard and non-state standard sizes available b) O.D.: 2-800mm 4) Colors: black, blue, brown Inner packing:Plastic bag Outer packing:Carton box We can produce according to your samples or drawings.