The Sizzix Thinlits - 664205 by Tim Holtz x12 Dies are cutting dies designed by Tim Holtz for Sizzix. This set includes 12 thin metal dies that can be used with a die-cutting machine to cut intricate shapes and designs from various materials such as paper, cardstock, and fabric. These dies are part of Tim Holtz's collection and are ideal for use in various crafting projects, particularly in scrapbooking and paper crafts. With these versatile cutting dies, crafters can create detailed and professional-looking embellishments for their projects with ease.