A unique adhesive makes these letters removable, repositionable and reusable. They are easy to use - just "peel and place". They adhere to any clean and dry surface that is smooth or slightly textured (even wood and painted brick walls). Fade-resistant, acid free, leaves no residue and never becomes permanent. Each package contains uppercase letters along with numbers and punctuation marks. Ideal for bulletin boards, signs, posters, presentation boards and much more. The 4" letters have 78 characters per pack. Sold as 2 packs for a total of 156 characters.