A unique adhesive makes the pieces in this set removable, repositionable and reusable. They are easy to use—just peel and place—and they adhere to any clean and dry surface that is smooth or slightly textured (even wood and painted brick walls). Fade-resistant and acid-free, the pieces leave no residue and never become permanent—ideal for bulletin boards, signs, posters, presentation boards and much more. The package contains upper- and lowercase letters, plus numbers and punctuation marks. You get 154 pieces; the largest piece measures 4".