Rainbow Ball Stress Relief Spinning Top (White), Puzzle Game Fun Stress Relief Magic Ball Brain Teaser Ball Premium Rainbow Balloons: Made of ABS plastic + elastic foam, non-toxic and lightweight, good quality for long-term use. The diameter is 7 cm, small and exquisite. HOW IT WORKS: The rainbow ball has 12 holes and 11 balls. Each rainbow ball has an outer ring that matches its color. You can transfer these balls from one hole to another and match colors. Train thinking ability: The process of disturbing the rainbow ball and returning requires careful observation and consideration. When returning to the position, analyze its internal structure, train the brain, develop intelligence and improve problem-solving ability. Small and easy to carry: The rainbow balloon has a neat appearance and a small size. Whether you are at home, at school or in your free time, you can easily take it with you to enrich your free time. Fun gift: you can give the rainbow balls as a gift to your friends or family members as Christmas gifts or birthday gifts.