Recommended for infants 6 months to 1 year old, the Fisher-Price Brilliant Basics Rock-a-stack encourages tiny hands and minds to practice basic grasping, gripping, and hand-eye coordination. This multicolored stacking toy also helps develop an infant's sense of color, size, and shape. The top ring of the stack is shiny and reflective with beads that move. Made of hard plastic, this toy stands nearly 9 inches tall.