Stair Treads 13 Indoor and Outdoor Use - Peel and Stick - Pattern 1 Ready to install: just peel and stick Attractive enough to install inside your home, but rugged enough to be installed outside Mildew and weather resistant Protect your stairs from wear, and help provide a safer non-slip surface (reduce the likelihood of slips and falls) Each set contains 13 stair treads measuring 23 x 8 inches each, 1/4" inch thick