Swarovski® Crystal SS48 (11mm) Crystal Clear Concise Flat Back - Style 2034. This flat back is sure to add sparkle to any of your designs! Swarovski Crystal Concise Flat Back Style 2034 No Hotfix are backed with platinum foiling for extra brilliance and protection to a variety of carrier materials using standard glues. They are durable, long lasting and versatile. Please note that these stones have no holes.