1) A kind of regular rolling shutter, only the difference from appearance of tie rod bases, its structures and parts are mostly the same
2) Strong and durable, beautiful appearance, high-strength, high toughness, corrosion resistant aluminum alloy which is double ply curtains, 6063T5 aluminum alloy material, fight back, scratch prevention, the surface is processed by oxidation blasting or fluorocarbon metallic paint.
http://www.jlfiretruck.com/shutter-door/base-rolling-shutter/oval-base-rolling-shutter-door.html