Giantex 43'' Aerobic Stepper Step Cardio Fitness Exercise Adjust 4''-6''-8'' w/Risers Nontoxic Surface & 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. Sturdy and Stable -- This product is made of durable PE , has good bearing capacity, and the material is elastic, which makes the exercise more safe and stable. Non-Slip Design-- This product is made of PVC, the non-slip surface design makes it much safer and easy to move, and the feet provides good stability and could protect floors. Platform size43.5 x 16 x 4(L x W x H).