Take a hands-on approach to learning letters. Specially cast from a unique stone and resin mix, these popular pebbles appeal to children's instinct to explore, investigate, sort and collect. They are durable enough to be used in sand, water and outdoors. Each pebble is engraved and painted with a letter, and will not fade over time. Pebbles measure between 30-45 mm. Safe for ages 2+.  Includes 50 pebbles; 3 of each vowel and two of b, c, d, f, g, h, l, m, n, p, r, s, t,  and one of j, k, q, v, w, x, z.