Excellent Design https://youtu.be/JCGi5wnYNqw-The door anchor of the product is made of a thick nylon band.-The door anchor stop is very large and soft and is designed to protect the door from scratches and dents.-Door anchor rings are made of metal rings to help protect your resistance band from damage.Flexibility-Available at all points of the door-Fitness product door anchors are made of dense and soft foam.-1.5-inch diameter-1.3-inch thick-Even if there is a huge space under the door, it can hold your belt at all points.-This feature greatly increases the number of exercises you can perform. Protect-The soft foam end of the anchor (plug) can help prevent scratches and dents on your door.-This is quite important because when you stretch the band, there will be a lot of force between the anchor and the door.-The rear end of the anchor (ring) is provided with a metal pull ring.-This can help protect your bands and create a smooth surface for them without abrasion when they are stretched.