The SWAROVSKI ELEMENTS chessboard cut crystal rhinestone is a design masterpiece. This gorgeous piece in a geometric square is shaped for maximum sparkle. Crystal AB is a wonderful choice of color because of its colorful iridescence. Please note that when using flatbacks, you should never use a glue gun or super glue (cyanoacrylate) as they will damage the foil backing on the rhinestones. Also be aware that while flatbacks are terrific for adding sparkle to clothing they should never be dry cleaned. Please follow the cleaning care instructions on your glue; many glues require that clothing be air-dried. If you do machine dry always turn the article inside out before being placed in the dryer to avoid damage.