... as 3.50-4, 4.00-4, 3.50-6, 3.50-8, 4.00-8, 5.00-6, 13*3, 6.50-8, 8.50-8, 9.50-8 etc. My factory ... produce various kinds of wheel inner tubes, such as 3.50-4, 3 ... .50-6, 13*3, 3.50-8, 4.00-8, 5.00-6 etc.Valve: bent valve or ... just in woven bags.(on your request). Wheel barrow inner tube 4.00-8