VSI have a system in which several different sizes of pre-punched cards are printed onto DIN A4 cardboard. You can use a standard printer to print the pre-punched cardboard. There is a fitting  card holder for every printed card. These containers come in different colours and of course in the Kanban colours yellow, red and green. The card which measures 200 mm x 67 mm is most frequently used and can be used for Kanban containers as well.