【Sturdy and Durable】Made from High-Denisty ABS material which is environmentally friendly, supports up to 550LBS with impact resistance, durable for a long time of use! Wide base is very stable so you don't have to worry about where you may have misplaced the "legs". 【Height Adjustable】The workout stepper designed with 3 different height levels (4''-6''-8'') to meet your different needs, offers more strenuous exercise, increase your calorie burning and strengthen your muscles, helps you lose weight keep fit ! 【Non-skid & Safe】Non-slip honeycomb surface has higher safety and anti-skid performance. Rubber feet under the bottom of each step and riser to protect floor and increase stability. It stable and does not slip on carpet or doesn't move around the hardwood floors.