13 Stair Treads - Indoor and Outdoor Use - Pattern 203 Each set contains 13 stair treads measuring 23 x 8 inches each, 1/4 inches thick 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