Put extra sparkle on jewelry and projects using the finest quality rhinestones. These flat back crystals have platinum foiling on the back for extra brilliance and protection. They are designed to add reflective sparkle to non-fabric surfaces such as plastic, metal, wood and more. For best results, use clear-drying Create Your Style with Swarovski Elements™ Glue Wand for Flat Backs. This package includes 30 clear rhinestones in 4mm.