Step Aerobics is a great, simple way to boost your metabolism, work your cardiovascular system, and lose weight. This step trainer comes with a durable, non slip surface and adjusts from four inches all the way up to eight, to accomodate users of all fitness levels. When youre done, the whole system is compact enough to conveniently slide under your bed or store in your closet. Get on your way to Step fitness in your own home. Slip-proof, durable mat on top, non-marking rubber floor pads. Platform and blocks are made of high-density polyethylene. Black and gray; 14 x 40 inch step surface. Adjustable to 4, 6, and 8 inches in height.