The STEP® is made of stable polyethylene for durability and long life. The platform has a non-slip, shock-absorbing ribbed mat for safety. The platform and the risers both feature non-skid rubber feet for traction and stability. The STEP® can be used for cardio and muscle-sculpting workouts. Includes a platform and four risers and can adjust to 4", 6" or 8" in height. Additional risers are sold separately.