18 months & up. This set of five stacking wooden blocks is perfect for introducing STEM and literacy concepts to your children early on. Each brightly colored block has five sides of letters, numbers, pictures, and shapes. This Pyramid of Play encourages block play and fine motor skills. Encourage children to identify the colors, shapes, and objects as they stack and explore each block. After your children stack the blocks have them try the shape sorting activity on the side of each block.