Acrylic Rhinestone Flat Back Cabochons, Faceted, Half Round, Redabout 20mm in diameter, 5.5mm thickThese acrylic rhinestone Flat Back Cabochons have flat backs and faceted front side. Adding brilliance and flash to your Jewelry design. Flat Back Cabochons magnify designs and patterns when placed on top of paper or fabric, other flat pad findings or cabochon settings.