Sizzix Thinlits Dies By Tim Holtz 73 Pack - Alphanumeric Theory. Spell out your sentiments with the Sizzix Alphanumeric Theory Thinlits Die Set by Tim Holtz. With 73 Thinlits Dies included in this metal cutting set, you can cut both Letters and Numbers in different sizes, great for personalising your craft designs. Create a large range of projects with this Die Cutting Set including everything from gift tags to card making. These wafer-thin chemically etched die sets are designed to cut, emboss or stencil a single sheet of cardstock, paper, metallic foil or vellum. They are simple to use, compact and portable for cutting at home or on the go. Compatible with most die cutting machines (sold separately).