This Thinlits die set, Stacked Tiles, Hearts, is designed by Tim Holtz for Sizzix. This die set contains 25 pieces. each heart has five layers. These dies are wafer-thin, chemically etched, and designed to cut, emboss, and stencil. These dies are designed to work with one piece of paper, cardstock, or vellum at a time and are designed to work with leading die cutting machines (sold separately). These dies can be used for cards, tags, scrapbook pages, journals, planners, art journals, and other paper crafting and mixed media projects.