... kinds of butyl and natural tube in china. 3.50-4 Our certificate is ECE,DOT,CCC and so on ... -4, 300/350-4, 350/410-4, 350-5, 350-6, 300-8, 300-10, 350-8, 350-10, 400-5, 400-6, 400-8, 10*400-6, 10 ... , 250-16, 250-17, 250-18, 250/275-10, 250/275-17, 250/275-18, 275/300-14 ... 275/300-21, 350-16, 350-17, 350-18, 4.10-18, 90/90-18, 110/90-16, 130/90 ... -15, 130/90-10, 130/60-13, 130/70-12, 120/70- ...