When you need a perfect, thin line for outlining in your mosaic, Contorno is your answer. Contorno is smalti that is pressed flat and handcut into 3/4" squares, only 2-3 mm thick. When cut into strips and laid on its side, you have a perfect black outline. You'll be surprised with how handy these little glass wafers are! And a little goes a long way-- about 45 pieces in 1/4 lb.- enough for an outline 90 inches long! Available in BLACK.