Ramp up your workout routine with the Apollo Athletics Large Aerobic Step. This step is made from high-density polyethylene and can be set to heights ranging 4, 6, or 8 inches. It"s complete with four risers and features a comfortable, non-slip surface. Ideal for aerobic exercise routines and low-impact workouts. Non-slip surface. Adjusts from 4 - 6 and 8 in. High-density polyethylene. Includes 4 risers. Manufacturers warranty included.