The PandaSolar ballasted solar roof mounting system, made of AL6005-T5 aluminum, features an Adjustable Angle Ballast and is specifically designed for the installation of solar panels on concrete flat roofs. Name: Panda Solar New New Aluminum Adjustable Angle Ballast for Flat Cement Roofs  Brand:PandaSolar Material: AL-6005-T5 MOQ:1PCS Lead time:Within 12days Product Origin:Xiamen,China Warranty:12years Certificate:CE certification