?Shanghai Blue Trade International Trade Co., Ltd. by the Foreign Trade and Economic Cooperation Bureau, the international trading company with independent import and export rights approved by the General Administration of Customs, the main products: steel tile, color steel glazed tiles, EPS polystyrene color steel sandwich panel , polyurethane sandwich panel, rock wool sandwich panel, extruded sandwich panels, paper honeycomb sandwich panels, a variety of handmade sandwich panels, activity ...