Our company is located in Qingdao-a Chinese rubber industrial base and the famous tourism seaside city in north China . AS one of the leading tyre and hand carts manufactures , we have our own GRANDSTONE ., and SEA-LINEfor tires . We export our products all over the world , such as :Asia , Middle East , Africa , South America , North Amoerica and European countries, ect. We have obained CCC, ISO9001, QS9000,European and American standard 'ECEand DOTcertification , SONCAP for Nigeria , and Gulf standard GCCcertification , Brazil INMETRO,etc. We develop ourselves by abiding by the rule of honest and keeping our words. Qingdao Doublestone Industrial Co.,ltd is a grateful for the support from all friendly partners and are looking forword to establishing long-term business relationship with anyone who is intrested in our product.