Details: • Watery habitats filled with swirling waves, beautiful shells, and fascinating corals will immerse children into imaginary underwater worlds that will inspire play, promote creativity, and enhance language development. • Each sensory stone is engraved on one side and smooth on the other to encourage open-ended small world play. Easy to set up and easy to pack away. • Set contains 18 stones – 6 each of 3 designs. • Size approximately (1-3/4" x 2") • Safe for 2+.