Look again; these are not your typical alphabet stickers! They are Alphabet Masks from Heidi Swapp! A mask is the opposite of a stencil. The masks are made from a flexible, reusable material with a repositionable adhesive on the back so the letters will stay in place as you apply any medium over the top. Try color mediums such as: chalk, watercolor, inks, acrylic and spray paint. Remove the mask letters, and store them back on the backer sheet to use again!