At last...the ring to top them all. This Fisher-Price Rock-a-Stack toy, made from plant-based materials*, offers classic stacking fun for babies. It features a wibbly-wobby rocker base & 5 colorful rings for little hands to grasp & stack. Stacking helps baby develop h&-eye coordination & introduces them to the concept of relative size as they learn to sort & stack from biggest to smallest! (* Toy made from a minimum of 90% ethanol extracted from sugar cane.)