The Asymmetric Square Flatback Rhinestone 2420 is a modern cut crystal from Swarovski. It features a multi-faceted face with all completely unique cuts and a brilliant color array that boosts this stones appeal. It is available in 10mm, 25mm, and 40mm and in a limited selection of colors. The 2420 Swarovski flatback is made of “advanced crystal” and is lead free. It can be glued onto a variety of hard surfaces and textiles.