From grasping and shaking to sorting and stacking this rock-a-stack toy offers tons of fun ways for your baby to play and explore. Younger babies will love grasping holding shaking and exploring the five colorful rings. The top ring has a shiny reflective surface with rattling beads inside to encourage their curiosity. When they're ready to sit and stack babies can place the rings on the post then bat at the wobbly base to make it rock back and forth. Stacking helps them develop hand-eye coordination and introduces them to the concept of relative size as they learn to sort and stack from biggest to smallest. Features. 5 Colorful rings introduce babies to relative sizing and stacking. Wobbly base rocks back and forth to enhance their sense of discovery. Shiny top ring with rattling beads encourages curiosity. Perfect for developing balance coordination skills and moreSpecifications.