Swarovski 2740 8.3mm x 8.3mm Triangle Gamma Flat Back Hotfix Blush Rose containing 216 beads. Please allow 3-4 working days for despatch of wholesale orders. Flat Backs Hotfix are loose crystal elements with a flat reverse side that has been pre-coated with a heat-sensitive glue. These Flat Backs can be easily applied to a large range of textile carrier materials using heat to produce a durable and long-lasting crystal effect. Flat Backs Hotfix are available in a multitude of colors, shapes, and cuts.