Birth & up. Build life sized forts, walls, and more with these soft, natural-toned blocks by Children's Factory. 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 natural-toned colors.