butyl inner tube OEM producing,more than ten yesrs 1200/20 1200/ ... 825/16 700/16 500/12 400/12 450/12 butyl inner tubeQingdao dayangzhou Rubber & Plastic Co., Ltd was founded at 2001 ... including a wide range of wheelbarrow tires and tubes, motorcycle tires and tubes, natural and butyl inner tubes, rubber wheel, pu wheel and castor wheel ...