18 months & up. When provided with rich, beautiful materials, the possibilities for discovery are multiplied. This set of translucent discs encourages children's relationships with nature through organic patterns and colors. Durable enough for continued use indoors or outdoors, this 20-piece set interacts beautifully with natural light or light tables, and is the perfect addition to loose parts play. Children can work on patterning, color recognition, and seriation as well as engage in tactile exploration. Each disc measures 2.8" in diameter.