Inner tube:Oil resistant synthetic rubber Reinforcement :Four altemating layers of spiral high -tensile steel wire Out cover:Environment resistant synthetic rubber Temperature Range:-40�°F to 212�°Fï¼?-40â?? to 100â??ï¼? Working pressure: 31.5Mpa Surface:Cloth cover or smooth cover Standard : ISO9001 Surface:Wrapped cover or smooth cover Colour:Black