An exact fitting ribbon cassette enables easy & user-friendly replacement & does not jump out during printing. Perfect harmonization between printer mechanism & ribbon transport means uniform distribution of color which, in turn, ensures a clean & pleasing appearance & also makes ribbon-tightening a thing of the past. Epson pays special attention to the particular properties of the print head, in order to ensure that the ribbon does not fray & there is no chance of it getting stuck. In addition, costly repairs as a result of defective print heads & cash register breakdowns are avoided. Likewise, Epson places great emphasis on the choice of ink in which the ribbon is soaked: quality of print out, even distribution of color along the length of the ribbon & predection of the print head pins from mechanical strain & chemical pollution are the important criteria which influence quality & perfect design.