Rolling Shutter Coils (also called shutter curtain coils or slats) are the main body of a rolling shutter system. These interlocking metal slats form a continuous curtain that rolls up around the shaft when the shutter opens and unrolls vertically to close the opening. Manufactured from galvanized steel (GI), aluminum, or stainless steel, rolling shutter coils provide strength, durability, and security for industrial, commercial, and residential applications.