Gymax Exercise Aerobic Step Platform Deck w/ Height-Adjustable Levels 4'' 6'' 8''Our aerobic step platform has many functions and is very suitable for you who like to exercise! This aerobic step platform is constructed of durable PP material which has strong load bearing capacity and anti skid surface, so it is not easy to bend and deform with safety. Three heights can be adjusted to meet different fitness needs. The features of portability and easy store save more space for you. Features: Suitable for aerobic exercise, enhanced