Swarovski Xilion Rose flat back comes with and without HF (Hotfix). Some sizes even come in the tantalizing HFT (Hotfix Transparent). see info on Hotfix
This product is available in a huge array of sizes and colours.
It can fully boast of the revolutionary Xilion cut which is the cut that enhances the crystal to a seemingly million-zillion points of scintillating points of light.