How Automatic Rolling Shutters Work: The Standard Poly corbonate rolling shutter is always Customized build in our modern factory. which combines with transperacy and strengthens with polycorbonate slot with aluminu/stainless steel tubes., it is an application for transparent and security. Polycorbonate shutters are widely used for Commercial shops and shopping centers, unlibe glass ... https://www.theeliteautomaticdoors.com/automatic-rolling-shutters/