Swarovski Flat Backs No Hotfix (No HF) are loose crystal elements with Platinum Foiling on the back for extra brilliance and protection. Swarovski Flat Backs No HF are easy to apply to a variety of carrier materials using standard one or two component glues. They are available in a multitude of colors, shapes and cuts. The most important single item in this product group is the XILION Rose – the most brilliant cut on the market.