** Use -For civil engineering & subway construction -For ships and fishing industries -For suction of water pumps -For water supply and water discharge requiring internal pressure and external pressure ** Characteristics -Strong internal and external abrasion resistance -Easy installation due to excellent flexibility, and easy flow during object movement because of flatness of internal and external surfaces -Our product was produced by fusing hard material and soft material in a coil state to allow strongly enduring internal and external pressures