Montessori Sandpaper Capital AlphabetsMontessori Sandpaper Capital Alphabets The Montessori Sandpaper Capital Alphabets are a tactile learning tool designed to help young children learn the shapes and sounds of capital letters. Each letter is made from fine grit sandpaper and mounted on a smooth wooden or sturdy cardboard board. The rough texture of the sandpaper provides a sensory experience that helps children trace and memorize the shapes of the letters with their fingers. This hands