Build, Topple, and Nest! From beautiful peacocks to powerful lions, these 10 colorful and sturdy stackable/nestable cardboard blocks are a perfect tool for early learning. Each block differs in size and whimsical, colorful illustrations which feature different Animals, Shapes, Numbers, Counting, Colors, and a puzzle in the form of a growing tree. Kids can stack the blocks on top of each other and make a tower nearly three feet tall. The largest cube is approximately 5.3 inches. Smart Play for early learning!