... of inner tubes in China. Our products includs butyl rubber and nature rubber inner tubes.The specific describtion is listed below:1 ... %6) Joint tensile strength: more than 5MPa7) Certificate:ISO9001:20088) Valve: TR13, TR15, TR75, TR75A, TR76A, TR77A, TR78A, TR175A, TR177A, TR178A ... -16TR15400-8TR15600-16TR15700-12TR15650-15TR15825-12TR15600-15TR15500-10TR15650-14TR15 Butyl rubber tube