Wedge-style door stop holds doors in any position. Flexible rubber material is for superior wedging action with Grip Cups for extra hold on Tile, Hardwood and Linoleum. Holds doors with up to 3/4 Inch clearance, (Please check your door clearance),...They are "rubbery" and that makes them durable and easy to grip on floors, not slippery like plastic ones, they have a Strong Rubber Scent for a few days.