... We are a professional butyl and natural inner tubes manufacture, our products has the high ... than 3.4MPa5 )Certificate:ISO9001-2000 SpecificationValve1200R24TR179A1200R20TR179A1100R20TR179A1000R20TR179A900R20TR179A825R16TR77A750R16TR77A700R16TR75A650R16TR75A Natural Inner Tube 1) Tensile strength: 8MPa,10MPa,12MPa,14 ... -12TR13400-12TR13 Natural and Butyl Inner Tubes(OTR,Agriculture,Truck and Tractor)