The Sandpaper Letters (upper case, print) are presented in the traditional colours of blue for vowels and pink for consonants. The letters themselves are fine-grit sandpaper on painted hardboard for a durable, long-lasting finish. The set includes an extra "y" in blue (twenty-seven letters in all) for instances where y is used as a vowel. Comes with a wooden storage box. Learn more about how to use the Sandpaper Letters at Montessori World and InfoMontessori.