Sensory Stacking TowersDiscover a world of texture, shape, and sensory wonder with the Sensory Stacking Towers set. Designed for hands on exploration and tactile discovery, this versatile set includes 39 sensory rich exploration rings crafted from a variety of materials including brush, wood, cloth, plastic, twine, and beads. Perfect for children aged 3+ years, these rings invite curious minds and busy hands to explore, match, sort, and stack in countless open ended ways.