Accordion shutters are made of heavy duty aluminum, operating horizontally, side to side. This is the system that is most commonly used by our customers, being simple to operate and affordable. It has also been engineered to meet /exceed the Miami-Dade County Product Control Division standards. They have an extended variety of options, such as stronger gauge for high rise building. They also provide different kinds of locks, including commercial lock systems for store fronts or for better security at home.