Premium Rainbow Balloons Made of ABS plastic elastic sponge nontoxic and lightweight good quality for longterm 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 move these balls from one hole to another and match the colors Train thinking skills The process of disrupting the rainbow ball and restoring it requires careful observation and reflection When returning to the position analyze its internal structure exercise the brain develop intelligence and improve problemsolving skills Small and easy to carry The rainbow balloon has a stylish appearance and small size Whether you are at home at school or in your free time you can easily bring it to enrich your free time Fun gift you can give the rainbow balls to your friends or family members as Christmas or birthday gifts