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 And 5 Colorful Rings For Little Hands To Grasp And Stack. Stacking Helps Baby Develop Hand-Eye Coordination And Introduces Them To The Concept Of Relative Size As They Learn To Sort And Stack From Biggest To Smallest! (*Toy Made From A Minimum Of 90% Ethanol Extracted From Sugar Cane.)