Rubber Materil: Door stopper is made of quality rubber which has features of good slip resistance, high elasticity and wear resistance. Non-toxic and safe durable. Multi-Surface Compatibity: Grips firmly on tile, concrete and wooden floor surfaces. Will Allow Your Door Stoppers To Work On Every Floor Surface And Protect Your Door And Wall. Hook Design: No need to drill wall or door and paste bonus holdersHook design is a new generation of products, door stopper will be used for your bedroom, living room, office, not just loyal to one location. Widely Use: Control the size of the door seam freely, confrontation strong winds, prevent lock - outs, deter injuries to childrens fingers at home. Stable Keep: Unique hollow design provides strong gripping power, provide Ultimate Gripping Power, thus preventing the movement of the door.