... keep a stable quality4.Raw material: natural rubber and butyl rubber5.Certificate:ISO9001-2000.CCC6.OEM Acceptable7.All size available8 ... . All size are available :Tyre and inner tube :2.25-17 ,2.50-17 ,2.75-17 ,2.50- ... 18 ,3.00-18 ,3.25-18 ,2.50-14 ,2.75-18 ,3.00-17 ... .00-8 ,3.00-10 , 3.50-8 ,3.25-16 , 2.75-21 ,3.50-17 ,3.50-16 ... -15 , 4.10-18 ,3.00-23 , 3.00-25 ,4.50-12 , 3.00-8 ,90/90-18 , ...