The Athletic Works 3-Level Aerobic Step Deck offers adjustable heights ranging from 4 to 8 inches, making it suitable for a variety of fitness levels and activities. This step/riser set is designed for home use and is made of durable plastic material. The black, gray, and blue color scheme adds a stylish touch to your gym or training space. This step deck is perfect for enhancing your workout routines with its adjustable heights and sturdy construction.  Can support up to 400 lbs.  Used twice to transport Mom from the car to the road.