Each set contains 2 to 4 of each letter of the alphabet. The lowercase letter is on one side and uppercase is on the other side. Vowels are red and consonants are black. Tiles measure 1" x 1-1/4", in molded plastic. Four sets of Two-Sided Alphabet Letter Tiles for word-building activities. 272 tiles in all, in a convenient 32-Compartment Classroom Organizer. Grades K–3.