(Set of 13) Non-Slip (23-inch x 8-inch) Stair Treads - Indoor and Outdoor Use We choose the color and pattern for you; you will receive one set of 13 stair treads, we will select any pattern that we have available Great for inside of your home yet rugged enough for outdoor use Protects your stairs from wear and helps provide a safer non-slip surface (reduces the likelihood of slips and falls) Easy installation: Tack/Tape/Glue/Staple (not included) Mildew and weather resistant