Norsk 25 x 25 Reversible Foam Flooring Gray Wood & Black 8 Tiles Norsk Reversible Multi-Purpose Flooring is now available in a Gray Walnut Finish and Black. These flexible floor mats are for indoor use in a business or home environment. Protect your floors with fashion and function. The added texture on the black side of the tiles is perfect for extra comfort or your favorite exercises. In a lightweight design thats easy to transport they are also shock absorbent easy to assemble/store and clean up with soap and water.