The Fisher-Price Brilliant Basics Rock-a-Stack is a modern version of a classic toy that has been enjoyed by children for generations. Its five sturdy and colorful soft plastic rings can be thrown, dropped and gnawed on without showing a scuff mark or a scratch. The Fisher-Price Rock-a-Stack is designed to help improve hand-eye coordination while teaching about shapes and sizes. Babies love the bright colors, as well as the added reflective surfaces and swirling beads. This baby learning toy is designed to stimulate, entertain and educate your child all at the same time. It is appropriate for children from the time they reach 6 months of age.