An option in adjusting the hard covers of Unibind SteelBooks, DuoBinders, PortFolios or Coversets is to make an imprint with a die. A text, logo or other art can be transferred to the die. By heat and pressure, the foil stamping machine imprints the image through a coloured foil into the surface of the cover. Once created, the die is durable and reusable. This imprinting method is very forceful, not very expensive and suitable even for small series.