... proof character 2.easily installing 3.timely delivery 4.good price Shandong boxing huide iron&steel co.,ltd ,a professional ... /T,ASTM,JIS &its equivalent the both metal meterialInner Material the sandwich panel thickness50,75,100,150,200mmVolume density 8 ... xingfu industrial park,boxing county,shandong province in china Good price of roofing Sandwich panel with more color choices--Factory