The Fargo 81579 thermal print head is engineered to allow your Fargo C15 or 4225/4250 card printer to issue professional ID cards and badges.With its field-installable design, the Fargo 81579 print head is ready to keep your custom card program up and running.The Fargo 81579 thermal print head is for use with the above-mentioned card printers with serial numbers including and above 90320134.