Purple Swarovski HotFix Flatback Classic Crystals are a 14-facet cut crystal, this gives the highest sparkle, also they are 32%-34% leaded crystals, the highest quality hotfix crystal available. A heat sensitive film of glue on the flat back of the crystal makes application easy and quick when you also buy the Professional Touchå¨ HotFix Rhinestone Applicator. Sold here in packs of 10.