Birth & up. Build small sized forts, walls, and more with these soft, natural-toned blocks. These blocks are the perfect stacking toy for little ones to learn about shapes and colors. The soft material makes them extra safe to knock down and more. Blocks are made of easy-to-clean polyurethane material. Blocks measure 5.5"H x 5.5"W x 5.5"D. Includes 15 blocks in a variety of nature inspired colors.