High Quality Rainbow Ball: Made of ABS plastic, non-toxic, lightweight, good quality, and can be used for a long time. The matte surface is easy to control. The blue rainbow ball uses unique luminous material, so that the puzzle ball can glow in the dark, improving the enjoyment of using.How it Works: The Rainbow Ball has 12 holes and 11 balls. Each rainbow ball has an outer ring corresponding to its color. You can transfer these balls from one hole to another and match the colors.Thinking Ability Exercise: The process of disrupting the rainbow ball and returning to its position requires careful observation and reflection, as well as an analysis of its internal structure upon returning to its position, in order to to exercise the brain, develop intelligence and improve the problem-solving ability.Small and Easy to Carry: The rainbow ball has an elegant appearance and is small in size. Whether at home, at school or for fun, you can easily carry it to enrich your free time.Fun Gift: Suitable for beginners and professionals, very suitable for reducing stress, you can give the rainbow ball puzzle as a Christmas gift or birthday present to your friends or family.