3 years & up. These beautiful stones offer a tactile and visual way of introducing young children to letter formation. Each stone is carefully engraved to provide important sensory feedback to help young children develop the movements needed for writing each letter. Starting at the green dot, children will enjoy tracing each letter shape with their finger, building important motor-memory skills. Each set contains 26 letter stones (3" - 5.3" approx.) and an activity leaflet.