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 with workout equipment, heavy weight-lifting machines, weightlifting competitions, etc. Commercial grade, indestructible 1/2" 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 and quality. The 12mm rubber rolls are the most impact absorbent rolls available on the market today, utilized in high-end gyms and areas where subfloor protection from heavy weights is required.