Our indoor stair treads offer 100% UV treated Olefin machine made construction with skid slip resistant marine backing. Strong construction for tough conditions. Beware of counterfeit products. Rug Styles Online is the manufacturer and only authorized seller of this product. We can not guarantee any quality or description accuracy of the purchase you make from any other sellers. 100% UV Olefin | Slip skid resistant rubber backing works on most of the floor types | Easy to vacuum and clean low profile | Corrugated construction for better traction and liquid flow | In order to keep stair treads securely in place, we suggest to use double-sided carpet tape (not included) . Indoor Use | Tough and Strong Construction | Waterproof | Great Value . Protect your stairs and create traction | Stain Resistant | Mildew Resistant | Fade Resistant. Size : 8 inch x 30 inch | Color: Black / Charcoal | Includes : Set of 13 Stair Treads