This rainbow puzzle ball crafted with safe high quality ABS material, lightweight and lies comfortably in the hand. This is a big rainbow ball with 12 holes and 11 colorful small balls inside, and a sponge in the center that allows the colorful balls to slide from one slot to the next when you press on them. You need to match all 11 balls to their corresponding colored rings to complete the puzzle. The magic ball is a puzzle game that requires concentration, careful observation and thinking, which can exercise the brain and improve the problem solving ability. And it can help kids reduce screen time and increase thinking skills, relieve work pressure of adults.