Ribbed construction for maximum strength while weighing less than 3 ounces. Extremely durable Polycarbonate plastic construction, the same as bullet proof glass. Small enough to fit in a pocket, strong enough to hold open the largest of doors and portable enough to hang on a uniform or trauma kit. Designed with a hole to assist with carrying and storage. Brightly colored for easy visibility to prevent attempts at closing the door while in use. Over-molded with Thermal Plastic Rubber pads to prevent sliding when placed on top of door or on the floor with a smooth surfaces. Notched to fit over top of hinge pin. Made in the U.S.A from 100% recycled Polycarbonate plastic. Eliminates the use of rolled up newspapers, flower pots, doormats or other objects to hold doors open.