Viking Strong Resistance Bands Door Anchor Attachment with Solid Nylon core, dense foam (won't hurt your door), super strong nylon webbing and neoprene padding. SUPER STRONG HEAVY DUTY CONSTRUCTION - The Viking Strong door anchor is designed and manufactured to be super strong. We have to make it robust, as the largest Viking Strong bands produce up to 175 lbs of tension. Every Viking Strong anchor is made with thick nylon webbing, heavy duty stitching and nylon inner cores for additional stability WORKS AT ALL POINTS OF THE DOOR - The Viking Strong door anchor utilizes dense but soft foam, that is 3 inches in diameter. Therefore, it can secure your bands at all points, even if there is a sizeable space at the top and bottom of the door. This feature greatly increases the number of exercises that you can perform. SAFE FOR YOUR DOOR AND YOUR BANDS - The soft foam end of the anchor will help prevent scratching and denting of your door. This becomes super important as you stretch the bands create great force between the anchor and your door. The loop side of the anchor incorporates neoprene padding. This will help preserve your bands by creating a soft surface for them to press against when they are stretched. 100% MONEY BACK GUARANTEE  We're SO confident that you'll love the Viking Strong door anchor that we offer a 100% Money Back Guarantee. Try this Viking Strong product RISK FREE. If it is not everything that we claim send it back within 60 days for a full refund.