4 years & up. A great way to introduce dozens of alphabet activities and to practice word building. Letters are 3/4" to 2" high and easy to pick up, made of tough, durable plastic. Lowercase letters (10 of each vowel and 5 of each consonant), and two each of uppercase letters for 414 letters in all. Vowels are red and consonants are blue. Also includes Alphabet Letter Organizer and Moveable Alphabet Guidebook.