Montessori Small Wooden Movable Alphabet with Box (Red & Blue, 5mm thick) After learning the letter sounds with the Sandpaper Letters, the Movable Alphabet is used by the children for the writing of words, as well as to get familiar with the letters and their sound for future exercises in composing words. We provide 30 Day money return guarantee, as long as you find the purchased item is different from our listed description and condition.