This package of 149 alphabet, numbers, and punctuation marks are Thickers chipboard stickers. These stickers are designed by Vicki Boutin for her Fernwood Collection for American Crafts. These stickers are customizable, you can color them with whatever medium works best for you. You will love that there are extra vowel stickers and 3 stickers of every number. There are also extras of the most common punctuation marks. These chipboard stickers are acid free.