The Cosmic Delta Flatback Rhinestone 2720 is a brilliant design from Swarovski. It features a triangle shape and multi-faceted angular sides that presents magnificent color arrays and brilliance. It is available in 7.5mm, 9mm and 12.5mm sizes in a limited selection of colors. This Swarovski Flatback is made of "advanced crystal" and is lead free. It can be glued to a variety of hard surfaces and textiles.