AirTricks are available in two common coloration themes (blue/mild-gray or all black) and may be fitted with coloured lining to your choice. It may be used on ground, h2o and grass . just ensure that there's no stone or sharp matters to the grass to hurt the track. This item https://cat-wheel79012.ageeksblog.com/27753242/about-air-track-mat-20-ft