4 years & up. A great way to introduce dozens of alphabet activities and to practice word building. Letters are 0.75" 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.