With throughput of 20,000 mail pieces/hr in multiline mode, Model 4210 prints any combination of fixed or variable text, numbering, bar codes, and multiple date/time formats. It uses solvent- and water-based inks and supports use of single-line, twin-line, and tri-line modes on appropriate fonts. Single printer uses 2 printheads which can provide 6 lines of print; system can be expanded to include up to 4 printers.