Build words with your Tri-Blocks and learn consonants and short vowels (CVC). Turn each block and manipulate the middle vowel sound or change a spelling with a consonant. The Tri-blocks slide together to make words, and can be twisted to change the spelling (manipulate a sound). Tri-Blocks let children know spelling rules by their color coding and unique block orientations. They are also for use with CVC Builder and Word Builder box card sets (sold separately). Teach phonemic awareness, word building and spelling with these CVC blocks. Details: 8.5" x 4.5" x 4.5" Set of 90 Covers consonant beginnings, short vowels, consonant endings syllable Beginning consonants are in dark blue, short vowels in red, and final consonants in light blue Comes in a handy storage tub Multi-sensory, hands on and fun For ages 4 and up Grades K-3