This package of 15 layered stickers is part of the Sweet Rush Collection designed by Vicki Boutin for American Crafts. These heart stickers have three layers each that can be fluffed for a 3D effect. Some of these stickers have holographic gold foil accents. These stickers can be added to cards, scrapbook pages, tags, journals, planners, and other paper crafting and mixed media projects. These stickers are acid free.