Also known as flatbacks, these crystal components are perfect for adding sparkle to scrapbooks, flip-flops, clothing, greeting cards, cell phones and more! Please note that when using SWAROVSKI ELEMENTS rhinestones, you should never use a glue gun or super glue (cyanoacrylate) as they will damage the foil backing on the rhinestones. Also be aware that while crystal rhinestones are terrific for adding sparkle to clothing they should never be dry cleaned.