7.50-16butyl inner tube OEM producing,more than ten yesrs 1200 ... 16 700/16 500/12 400/12 7.50-16butyl inner tubeQingdao dayangzhou Rubber & Plastic Co., Ltd was founded ... 2001. It's located at Poli Industrial Zone, Jiaonan City, Qingdao, ChinaIt's specialized in producing rubber and plastic ... and tubes, motorcycle tires and tubes, natural and butyl inner tubes, rubber wheel, pu wheel and castor wheel, etc ...