Our company is qingdao Oteya group co. Ltd, the largest manufacture of tyre and hand truck in China, the group has been in iso9002. Many tyres have got certification such as: 'ece'(europe), 'dot'(usa), ' gcc'(middle east). For the hand truck,100 of groups products carry GS certification. Pls tell me details of your requirement, we can provide you the high quality product and best price. Pls contract me by e-mail.