These colorful jumpping balls are made of and environmental friendly material, safe for children to use. It is one of the best fitness equipment, good outdoor entertainment Toy. Suitable for fitness and leisure time activities, etc. A great gift for children. Features - Color: Blue+Red+Yellow+Green - Materail: Plastic - Size: 33x6x6cm. - First put the foot into the circle, push the ball to the left, and then start to jump. - Then, the jumping ball is suitable for children to play, physical exercise, is a good helper to exercise. - It can play a certain role in the health of the human body, can drive the legs, abdomen and upper body, and exercise together. - Promoting body metabolism, his exercise and effect are better than skipping and running, more interesting than skipping and running.