Rub-Ons are perfect for scrap booking, greeting cards, gift wrapping and much more. They are permanent, smooth to touch, acid-free and scrapbook safe so they'll last. ...simply turn rub-ons upside down on a piece of paper and use a popsicle stick to rub the back of the image. The image will then appear on the piece of paper. 12" x 4" Sticker Sheet Stickers are acid free and photo safe.