... kinds of butyl and natural tube in china. 3.50-4 Our certificate is ECE,DOT,CCC and so on. ... are as follows: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, ... /650-14, 7.00-14, 7.00-16, 7.50-16, 225/250-17, 250-16, 250-17, 250 ... 275/300-21, 350-16, 350-17, 350-18, 4.10-18, 90/90-18, 110/90-16, 130/ ...