3 years & up. The letters in these sets are correctly proportioned and include more of the letters you need most - extra vowels: a, e, i, o, u; and consonants: b, l, m, r, s, t. Strong magnets on the back provide a "sure grip." color-coded with red vowels and blue consonants. Letters measure 1.5" tall. Available in Uppercase Letters, Lowercase Letters, or a set of Uppercase and Lowercase Letters.