BeadTec's Lunasoft lucite Foiled Flat Back Cabochon in Copper 12mm Round. Lunasoft cabochons catch and reflect light beautifully. This 12mm round size pairs well with all types of projects. BeadTec's lunasoft products do not get sticky like the lunasoft products offered at most other places, because the acrylic is tumbled for the matte finish instead of coated.