The revolutionary Sizzix Simple Impressions Embossing Folders use a patented system that makes embossing quicker and easier than ever before. On opposite sides of a clear plastic folder, Sizzix uses a positive hard plastic mold, which nests into a negative brass stencil and creates a sandwich for your cardstock to be embossed. Simple Impressions Embossing Folders come completely assembled and are specifically designed to be used in a Sizzix Machine with a Sizzix System Converter. They can be adapted for use in the Sidekick by using specially formatted Sidekick Embossing Folders (all products sold separately).