Sizzix DecoEmboss Dies - By Vintaj

Each DecoEmboss die elegantly embosses beautiful designs onto different shapes of Vintaj blanks. Use it to create or decorate unique metal embellishments for personalized projects such as jewelry, cards, scrapbook pages, boxes, frames and much more. For different design possibilities with a DecoEmboss die, place the metal blank onto varying areas of the die with each use. (This gives the added benefit of more even wear.)

Here's an overview of both the DecoEmboss and DecoEtch dies:

And this video concentrates on just the DecoEmboss dies:

This is one of the categories under Sizzix Dies.