Flatback crystals are perfect to use on a flat surface: Glue these crystal rhinestones onto flat pad posts, jewelry blanks, shoes, phones, electronic devices, and a whole lot more! For best results, we recommend gluing all crystal with two-part epoxies. Choose from several colors of flat backs in an assortment of shapes, and get wholesale prices when you buy in bulk. Specialty frames and glue-in settings are available for most of these crystals.