Swarovski Rhinestones Non HotFix crystals need to stuck with a glue such as Gem-Tac glue. These crystal components have platinum foiling on the back, which have a flat underside so they can be applied to different materials and are very easy to glue onto virtually any material. These are perfect for adding that sparkle to clothing like wedding dress, Mobile Phone, Nail Art items, greeting cards or other decorative items !