Made from durable molded plastic and these bed risers add to the height of your bed creating instant under bed storage. Fit bed posts of up to in diameter. Perfect for home or dorm room. Easy to use, simply place bedposts I the recessed walls of the riser add in height to the bed. Recessed walls fit up to a bed post and ensure that your bed will not slip and fall. Made of durable molded plastic, add height to your bed without worry of the risers breaking creates instant under bed storage space bed risers may be stacked together when not in use to conserve space.