Step up to a higher level of comfort, safety and quality with this set of four Aqua Shield stair treads. Beyond scraping dirt from shoes and paws, these stylish stair treads have an exclusive “water dam” design for unbeatable absorbency. Resistant to the most extreme weather elements, they're certified slip resistant by the National Floor Safety Institute—making them the ultimate way to go inside and out!Set of 4 | 100% polypropylene face is anti-static, quick drying and resistant to the most extreme weather elements, including intense sunlight | Synthetic rubber underside keeps stair treads in place though stair tread installation tape is highly recommended | Permanently molded design will not crush mildew, mold, or rot | Low-profile design allows door to swing over the treads without catching | Suitable for indoor/outdoor use | Sweep, vacuum or hose clean | Skid-resistant synthetic rubber backing is made with 25% recycled rubber | Made in the u.s.a.