material: natural and butyl strength: 7MP, 8MP, 10MP, 13MP, 14.7MP elongation: 380%, 400%, 450%, 480%, 500% Product Feature: 1.zero defect 2.Best gas-tightness 3.long life span 4.competitve price and manufacture directly 5.We have truck butyl and natural inner tubes with different models and surprised quality 6.We can print your brand on the tube. we can supply this following sizes:inner tube for ...