Features a skid-resistant rubber backing - keeps them from bunching and shifting under your feet Creates a safer environment for your friends, family and furry loved-ones Suitable for most hard stair surfaces and helps to preserve the natural beauty of your floors Double-ribbed design provides excellent traction and traps dirt that gets tracked in Made of long-lasting polypropylene carpet fibers House, Home and More’s Skid-Resistant Double-Ribbed Carpet Stair Treads feature a skid-resistant rubber backing which keeps them from bunching and shifting under your feet. And more importantly, they create a safer environment for your friends, family and furry loved-ones! These stair treads are suitable for most hard stair surfaces and help to preserve the natural beauty of your floors. The double-ribbed design provides excellent traction and traps dirt that gets tracked in on shoes and paws. Made of long-lasting polypropylene carpet fibers, these treads are perfect for the wet winter months and seasonal spring rain. They are also easy to clean with a hand-held vacuum or hose attachment and can be spot cleaned as needed. Due to the skid-resistant rubber backing they are not machine washable. Although these carpet stair treads have a skid-resistant backing, they do not attach to your steps. To ensure that they do not move, you may also apply double-sided tape or carpet tacks (not included).