●Dimensions: 1560 X 537 X 1050mm ●Main material: steel pipe ●Installation method: direct buried ●How to use: Grasp the armrest, step on the pedal, back to back, slowly back, relying on its own weight to swing the seat back and forth to fully extend the waist and abdomm. ●Main function: stretch the hip joint and spine, relax the back muscles.