Thermal Printer Cleaning Card 4x6-101.6mm x 152.4mm Series 212 (3 Layer) This product features patented Evanish solution that effectively breaks down dirt and debris in the card parth and on theread head for effective cleaning; safe to use on electronic components. Printers become dirty from "paper dust" and adhesives as well as environmental contaminants such as airborne grease particles. Cards clean the printhead and any build-up on the printer's rollers. Clean your Thermal Printer with every media roll change or at least twice per month. Printers become dirty from "paper dust" and adhesives as well as environmental contaminants such as airborne grease particles. Cards clean the printhead and any build-up on the printer's rollers. Clean when experiencing poor print quality, illegible receipts, paper jams or print voids. This card can be used on barcode printers, direct transfer printers, label printers, receipt printers and ribbon transfer printers