CVC Words KitBuild CVC words with Tri Blocks! Tri blocks slide together to make words make new words by turning the middle block to choose a new vowel sound or by turning the beginning or end block to choose a new consonant. Tri blocks are colour coded: beginning consonants are dark blue, short vowels are red and final consonants are light blue. A set which includes the CVC Tri Blocks Tub and the CVC Builders Activity Cards. Suitable for children ages 5 8 years.