These aluminum poster & sign display frames are ideal for schools to mount indoors or outdoors. Display rules, maps, schedules, room number listings, & more! Made with a self-closing spring-loaded aluminum frame for an easy document, sign, or poster change out - simple flip open the frame, change out your item, and snap closed. The frame will hold your item securely in place. Clear, matte plastic covers the entire item in place and the frame also features plastic backing inside to keep moisture out.