The Norsk 240275 Interlocking Foam Mats are made from recycled materials to providing a environmentally friendly flooring solution for your garage, basement or any other room of your house. These foam mats will endure years of use and have anti-slip texture on both sides. This foam mat assembles easily like other flooring options including, puzzle mats, foam tiles, garage tiles and foam play mats. This 4-piece set is reversible, allowing you the option of all gray, all black or a checkerboard pattern. We also include (8) straight edge borders to provide a finished, uniformed look. This thicker grade mat has a patented reversible design making it functional for an infinite variety of uses and applications. Patents US 9,289,085; US D532,238; US D543,764 and Patents Pending.