Material: Made of environmentally friendly PP and PVC materials safe tasteless and environmentally friendly reducing noise and avoiding damage to the floor. (It is recommended to be over 5 years old) Design: Foldable design built-in elastic strap and comes with a backpack making it more convenient to carry. When you need to use it you can open it to play and when you dont need it just fold it and put it in a bag. Manufacturered by XIZHI. Exercise: There is a thick padding on the ankle loop which can provide comfort and effectively protect the childs ankle from impact. Ankle jump toys help exercise burn excess energy and make fun for children and friends. Aerobic exercise. Built-in flash: flash when rotating (inductive design no battery or charging) every time you skip the rotating wheel will automatically produce a multi-color light show. Dimensions: Total length: 25 1/2 inches foot ring diameter: 4 1/3 inches (can be opened to put the feet) rotating wheel diameter: 4 inches.