We are China Seals factory,Website:http://www.sealsmanufacturer.com, professional NBR Rubber seal o ring and mechanical seals manufacturer. Buna-N Orings Metric ID 0.05-680mm. Hardness: 40-90 Shore A Material: NBR/Nitrile/Buna-n Rubber Supply Ability: 1000000 Piece/Pieces per Month Working Temperature: 60â?? - +230â?? Packaging Details: Plastic Bags inside, Carton Boxes outside . Customized packing is welcome. ** Rubber O Ring ** Free samples offered for testing before batch order ** Products with ISO9001 and TS16949 certification ** ROHS, SGS certified Tell us what you want to seal, what conditions and specifications you need to meet, provide us with a print and we'll custom design the part to meet your specs.