The rugged rubber and advanced design of this doorstop ensures that it can stop any door, on any surface, every time. The gap under every door is different and the Alben Rubber Door Stopper is uniquely suited to adapt to this variation in space. Simply place the door holder in the path of the door, then using your foot to hold the stopper in place, gently guide the door onto the door wedge stopper, gently compressing the stopper down and under the door, making sure to stop before reaching the top of the wedge. The specially engineered struts in the door stopper bend under compression, then exert significant stopping force both up into the door and down into the floor. The friction resulting from the spring of the rubber in the doorstop makes this a great door stop for tile, door stops for carpet, or for wood, concrete, vinyl, or epoxy floors.