This six piece Thinlits die set, Spencer Colorize, is designed by Tim Holtz for Sizzix and is part of the Halloween Collection. This die set features a detailed skull with a variety of layers. This die set is designed with Colorize technology, which is an intricate paper layering technique. These Thinlits dies are wafer-thin, chemically-etched dies that are designed to cut, emboss, or stencil a single sheet of cardstock, paper, metallic foil, or vellum. These dies are compatible with leading die cutting machines (sold separately). These dies can be used for cards, scrapbook pages, tags, journals, planners, invitations, and other paper crafting, mixed media, and home decor projects.