12 months & up. Combine sensory and light play, building activities, and social-emotional development with this colorful set of Mirror Foam Blocks. These blocks come in various sizes and colors, and each one has an inset mirror. Children can use the blocks to stack and build together as well as learn to recognize themselves, their peers, and their colors. Their durable foam material enables children to use them both indoors and outdoors. Children can also combine them with natural sunshine or other light sources to create intensified sensory experiences. Largest piece measures 11"L x 5.5"W x 1.5"H.