Rubber rolls fit together perfectly and lie flat with no curling. This heavy-duty, non-porous, rubber floor matting has a textured surfaces for greater traction and a longer useful life. Ideal for use in workout areas and under equipment including treadmills, ellipticals, and weight-lifting machines. High-density, indestructible 8 millimeter thick rubber. Rubber flooring shields the floor from damage while protecting exercise equipment from vibration & carpet fibers, which can build up...