Swarovski Rhinestones Non-Hotfix Flatback crystals in Wholesale factory packs of 1440 crystals. Each ss12 crystal is 3.2mm in diameter and has a foil backing and faceted crystal glass face cut into the Xilion Rose Enhanced 2058 or 2028 design. They can be applied to a wide range of surfaces using the correct adhesive such as electrical gadgets, footwear or clothing.