Color and color density varies from roll to roll based on the raw rubber used in the production Eco rubber rolls are manufactured from heavy-duty, non-porous, rubber, which has a slightly textured surface for enhanced traction and greater durability, even in the most demanding environments. These rubber roll mats lie together perfectly and remain flat without curling up along the edges. Ideal for use in workout areas with free weights and also under equipment including treadmills, bicycles, ellipticals, and weight-lifting machines. High-density, indestructible 8mm thick, premium rubber - same rubber as more expensive rubber roll matting These rubber roll mats protect flooring from wear and tear from fitness equipment, machines, weights and frequent impact while greatly reducing from vibration & deterioration from carpet fibers. Eco Rubber Roll Matting is heavy-duty rubber flooring made exclusively from the remnants of other rubber rolls by grinding down the excess rubber and reforming it into a new roll with the same quality as our standard Rubber Roll Mats. An economical and Earth-friendly alternative that retains all the protective and cushioning qualities of more expensive rubber roll matting! Standard 8mm Thickness