-Heavy duty 12 gauge steel -Filled up with polyurethane for energy saving -Double pane E glass, tempered and sealed to avoid conditioning leaks -Included weatherstrippings to reduce air infiltration -Operable glass panels that can be opened independently from the doors -Thresholds made to prevent water infiltration -Barrel hinges which are perfect for heavy use and can be greased for a better use -Double doors include a pre insulated flush bolt system to lock the dormant door or unlock it for a complete opening space -We can make any design hurricane resistant