The modern take on the traditional toy is its stacking Action Toys--instead of a pole around which plastic rings are stacked, each ring has a half ball at the center and a hollow base, so they fit inside each other. This means that the rings can be stacked two ways: in ascending and descending order of size. And though six-month-olds (the beginning of the recommended age range) won't be able to complete the stack, they will enjoy the wobbly base and surprise rattling smiley ball at the bottom, as well as the bright colorful rings. Features: Plastic Material BPA Free, a unique stacking action means the Tomy Be Happy Stack can stack in 2 different ways for twice as much fun. The smiley faces in the centre of the ring and the rattle ball that's hidden in the base will captivate and surprise baby.