Crafted out of double-wall nylon strap material that is double-stitched for added strength. This Barrier Strap features a universal design that measures 45in.L x 3-1/2in.W, which allows it to be used on almost any style doorway. Strap incorporates magnets on each side (inside the double-stitched nylon pull tab) for quick application to metal door frames, hinges or door strikes. The unit can be used indoors or outdoors, and simply rolls up for easy and compact storage anywhere. This strap reads, "DO NOT ENTER CLOSED FOR MAINTENANCE" on a vibrant yellow backing, to offer high visibility.