43 Inches Height Adjustable Fitness Aerobic Step with Risersey Features Nontoxic Surface and Base: The material of this product is nontoxic, and the kids and old people all could use it. It would also give you good exercise feeling. Safety Design: This product has rounded corners and could reduce injury risks, it's more humanized and could prevent you from unnecessary hurts. Adjustable Height: This product meets with users of different fitness level to build endurance, strength and improve overall wellness.