Fun to Play- 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. Safe Material- This rainbow puzzle ball crafted with safe high quality ABS material, lightweight and lies comfortably in the hand. You need to match all 11 balls to their corresponding colored rings to complete the puzzle.