... and also good for interior use 1) Material: high end aluminium shutter2) Specification: Louver/blade:63.5mm/88.9mm/ ... 114.3mm width(12mm thickness)3)Structure: hurrican proof aluminium shutter4) Finish: Quality prime, unbeatable surface coating, waterproof ... air permeability, sunlight, sound, heat, environmental-friendly6) Colors: white, silver, ivory, black7)Opening way: Leveling opening, bi-fold ...