The Rhombus Hot Fix Flatback Rhinestone 2709 is a classic shape with modern brilliance from Swarovski. The crystal’s diamond shape and multi-faceted top offer the ultimate in brilliant and structural appeal. It is available in 10x6mm and 13x8mm sizes in a variety of colors. This Swarovski Flatback is made of "Advanced Crystal" and is lead free. It has a heat activated glue already applied to the back of the stone for easy and strong hot fix application to fabrics.