Made with plant-based materials, the Fisher-Price Rock-a-Stack toy is a classic stacking toy for little ones. The wibbly-wobbly rocker base is made for bat-at fun, with 5 colourful rings for little hands to grasp and stack.A Fun Learning Tool Stacking the rings helps baby develop their hand-eye coordination. The Fisher-Price Rock-a-Stack baby sensory toy introduces the concept of relative size as baby learns to sort and stack the rings from biggest to smallest.Plant-Based Toy The Fisher-Price Rock-a-Stack baby sensory toy is made from a minimum of 90% ethanol extracted from sugar cane. It even comes in FSC certified packaging for greener play.Sensory Play Baby sensory toys are hugely beneficial to your child's development. This baby sensory toy has bright colours and hands on activities to stimulate your baby's senses.