The printing block holders are used on the same mounting ring and also imprint consistent information. Typically, signatures, words or copy names are imprinted, such as "Original", "Duplicate" or – in security printing – the name of the current treasury secretary. LEIBINGER printing block holders print simultaneously with the numbering machines, in the same color used to print the numbers. Different versions are available on request. Printing block holders can be exchanged quickly and easily where necessary.