Appropriate for Grades PreK - 4 Build Word Knowledge One Letter or Sound at a Time! Unifix Consonant-Vowel-Consonant Letter Cubes consist of 90 letter cubes - 60 blue consonants and 30 red vowels. The letter cubes attach smoothly and stay connected but come apart with ease. Learning to find and sort letters will help children gain a comfort level with the alphabet. Pre-readers enjoy making their names and learning to associate beginning letters with common words. The Letter Cubes come in a handy, plastic storage container with lid and a resource guide listing games and activities that can be done using the Unifix Letter Cubes.