Swarovski 2088 flat back rhinestones are the latest and most brilliant cut available from Swarovski. Made in Swarovski's proprietary formula of Advanced Crystal**, this exceptionally brilliant stone, named after the brightest star in the night sky, Sirius, simply cannot be outdone. Ideal for gluing in place, the crystals have a silver mirror for exceptional shine with a protective platinum pro foiling on the back for superior glue retention. Shown here in Crystal with the AB effect added (Aurora Borealis). Note: Please glue carefully. You can read specific instructions from Swarovski in our FAQ by clicking . **Crystal glass and all other materials containing 0.009 % lead or less.