These Mono Serra flooring planks provide a great-looking, high-performing solution for your flooring needs. The grey planks have a real wood look and are made with a stone and plastic composite that's safe, effective, and durable. They're easy to install and let you get the job done faster due to their easy click locking system. The planks can be laid over various base floors, such as concrete, plywood as well as existing floors. This flooring requires an undercoat and is compatible with heating cables. Each package contains eighteen 3.5 mm-thick planks that cover an area of 35.69 square feet. Backed by a 25-year limited warranty.