... proof, burgary proof Aluminum roller shutter door Aluminum roller shutter door Material is Using 97% purity aluminum ingot 6063T5; Surface ... powder-coating / galvanized Guarantee period : 2 Years Rolling shutter function: Anti-sunlight, anti-rust, anti-lacerated , anti ... -keeping .Save energy, when the roller shutter closed, can saving 30% energy, obstructed 100% sunshine. Aluminum roller shutter door