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Tub of 90 pieces, Contains 90 colour-coded blocks Includes a teaching guide, 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. Tri-Blocks® let children know spelling rules by their colour coding and unique block orientations. Teach phonemic awareness, word building and spelling. Tub contains 90 x Tri-Blocks®.