This 13 piece Thinlits die set, Otis Colorize, is designed by Tim Holtz for Sizzix and is part of the Halloween Collection. This die set is designed with Colorize technology, which is an intricate paper layering technique. This die set features a crescent moon with a star hanging from it and a bat. 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.