18 months & up. Seashell-shaped manipulatives contain different tactile patterns for sorting, matching, counting and sensory exploration. Made of eco-friendly composite, each shell has its own grain and slight color differences. Users can use the stones for sensory discovery, imprint making into doughs and sand, or even role play. Includes 36 tactile shells, 2 of each in 6 different tactile finishes, and 3 sizes. Each stone measures about 2".