Finally...a ring to top it all. This plant-based Fisher-Price® Rock-a-Stack® toy offers kids classic stacking fun. It features a rocking rocking base and 5 colorful rings that little hands can grab and stack. Stacking helps baby develop hand-eye coordination and introduces the concept of relative size as they learn to sort and stack from largest to smallest! (*Toy is made with at least 90% ethanol extracted from sugar cane.)