material: natural and butyl strength: 7MP, 8MP, 10MP, 13MP, 14.7MP elongation: 380%, ... span 4.competitve price and manufacture directly 5.We have truck butyl and natural inner tubes with different models and surprised quality 6.We ... . we can supply this following sizes:inner tube for truck and car, for tractor tire, for PRC, OTR tire: A.18 ...