... kinds of butyl and natural tube in china. 3.50-17 natural inner tube Our certificate is ECE,DOT,CCC 1 ... : 250-4, 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*500- ... 7.00-14, 7.00-16, 7.50-16, 225/250-17, 250-16, 250-17, 250-18, 250/275-10, 250 ... , 275/300-14, 300-12, 300-16, 300-17, 300/325-17, 300-18, 300/325-18, 325-16, 325 ...