4PCS Black Spring - Door Stopper with Door Protector

Material: Made of plastic and it will help prevent your dogs from chewing on the door stopper Good for rough surfaces: These door stoppers can be placed on wood, cement, tile and carpet. A relatively rough surface will be better Application of door wedges: These door wedges can serve as useful tools for windows, metal doors, glass doors, wooden doors, self-closing doors, house doors , etc