-Heavy duty 14 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-Opeerable 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 resistan