3 months & up. Block play promote hand-eye coordination and tactile skills development with these wonderful Tactile and Sensory Blocks. This colorful set of tactile blocks has texture for added sensory play with block play. Encourage children to roll the blocks or stack them up. Use these blocks to teach children about shapes and colors. Have them describe the way the textured blocks feel. Each block is 4" square with each side having a different texture, color, shape, and feel. Washable. Colors may vary.