The flat back rhinestones are widely used and perfect for apparel and cell phone. All of our rhinestones are only sold in original sealed-pack from Swarovski 10 gross (1440 stones) per pack for most sizes, 2.5 gross (360 stones) available for SS30 stones, 1 gross (144 stones) available for SS34/SS40 stones, 0.5 gross (72 stones) available for SS48 stones. Before Starting Crystallized your mix and match idea with Swarovski rhinestones, don't forget to prepare rhinestone supply: GEM-TAC Permanent Adhesive, rhinestone picker and Swarovski crystal color chart (actual stones) to get a better idea about the colors before ordering. The Rhinestone Color Chart is strongly recommended for accurate color representation due to the exact crystal color won’t be presented in print or online.