Easy to install in a variety of sizes Rolls fit together perfectly and lie flat without curling. Non-porous, 100% vulcanized rubber mats have slightly textured non-slip surfaces Excellent for use under workout equipment, such as treadmills, stationery bikes, and weight-lifting machines Commercial grade, indestructible 3/8" rubber with a 5 year warranty Rubber Roll Floor Matting is heavy-duty rubber flooring that helps protect floors from heavy weights and constant impact of machinery and exercise equipment. These are the "original" composition rubber fitness floor. These durable rolls set the standard for performance, quality, and affordability.