2 years & up. Encourage experimentation and curiosity with an authentically inspired set of Big Bones. Exploration of big bones can be an engaging and educational experience for young children, sparking their curiosity about the natural world and fostering a deeper understanding of anatomy, history and science. Children can take this easy-to-clean, weighted set outside for exploration with messy materials like dirt, mud, or water, or use inside during loose parts activities. A variety of lengths encourages the discovery of size relationships, counting, and patterning.