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. Rock-A-Stack toy is designed for children ages 6 months and above.