The toy consists of a brightly colored plastic base and five hollow, plastic rings of different sizes. The rings can be stacked on the base in order from largest to smallest. The base is weighted so that it will rock back and forth when the rings are stacked on it.

The Fisher-Price Rock-a-Stack is a great toy for helping young children develop their motor skills, hand-eye coordination, and problem-solving skills. It is also a lot of fun for them to play with.

Here are some other features of the Fisher-Price Rock-a-Stack toy:

The rings are brightly colored and have a variety of textures for babies to explore.The smallest ring has a rattle inside of it.The base is weighted so that it will rock back and forth when the rings are stacked on it.The Fisher-Price Rock-a-Stack is a timeless toy that is sure to provide hours of fun for young children.