The Square Flatback 2402 is a simple square rhinestone from Swarovski.  This square stone has four small side facets all angling slightly to produce a large elevated flat surface at the stone’s top.  The 2402 style is available in 4mm, 6mm and 10mm sizes and in a limited selection of colors.  The Base Flatback from Swarovski is made of “Advanced Crystal” and is lead free.