Quality product and design - werfit door anchor is made with thick heavy duty nylon webbing. The door anchor stopper is large and soft, built to protect doors from scratching and denting. The door anchor loop is made with additional neoprene padding to help preserve your resistance bands from damage. Versatility - works on all points of the door. Werfit door anchor utilizes dense but soft foam that is 3 inches in diameter and 1.5 inches thick. Therefore, it can secure your bands at all points, even if there is a sizable space at the bottom of the door. This feature greatly increases the number of exercises that you can perform.