... of butyl and natural tube in china. Our certificate is ECE,DOT,CCC and so on nner Tube 4.00-8 1. ... 7.50-16, 225/250-17, 250-16, 250-17, 250-18, 250/275-10, 250/275-17, 250/275-18, 275 ... /300-14, 300-12, 300-16, 300-17, 300/325-17, 300-18, 300/325-18, 325-16, 325 ... , 275/300-19, 275/300-21, 350-16, 350-17, 350-18, 4.10-18, 90/90-18, 110 ... 130/70-12, 120/70-12 etc. natural and Butyl inner Tube 4.00-8 ...