Tianjin Guangshengyuan Export and Import CO.,LTD is the sub-cmpany of Tianjin Zhongmao Prestressed Co.,Ltd. We are professional manufacture of Prestressed products. Our main products is corrugated duct, flat one and round one; PC strand; PC wire; Anchorage; Galvanized Duct , Jack, Pmp and other Equipment and so son By now we have export our product to more than 20 countries We could give you the best service and best quality products