A favourite classic toy， the Fisher-Price Rock-a-Stack is a must-have in every baby?s toy box. The Rock-a-Stack lets baby stack 5 brightly coloured rings， then bat at the base to watch it rock back and forth. Each ring is a different size and colour， from biggest to smaller to smallest. Top off the stack with the top ring， decorated with colouful shapes and swirling beads. The Rock-a-Stack teaches about size and sequence as baby learns to put rainbow rings on the rocking base in the proper order. If a ring is placed out of sequence， it won?t fit! Bright colours and fun rattle sounds stimulate baby?s senses.