Tape Free: No tape, adhesive, glue. The backing has self-adhesive. Stair treads can be firmly stuck to the stair floor, and its back has a non-slip function to prevent the stair mats from moving when walking. Our stair treads protect your stairs from everyday scratches and wear. Don't worry about it damaging your hardwood floor, there will be no residue after installation Bullnose Design: Its advantage is that can protect the edges of the stairs, which is a function that many products don t have. The edge of the staircase is the most prone to wear, and installing this stair mat can save you from trouble.