Lexmark 12A5745 Non-Prebate High Yield Black Print Laser Printer Cartridge for the Lexmark Optra T 610 / 612 / 614 / 616 Series Laser Printers. Lexmark has engineered its Optra T high yield print Laser Printer Cartridges as an integral component of the Optra T family of Laser Printers. They are designed and manufactured to meet the extraordinary demands of the Optra T Laser Printers. The competitively priced 25,000 page (at approximately 5% coverage at comparable industry settings - print darkness = 5) Laser Printer Cartridge is an excellent choice for customers with high print volumes. It will produce consistently superb quality throughout their specified life, including 1200 dpi quality printing with super smooth grayscale transitions at print speeds of up to 35 pages per minute, extremely reliable duplexing, and the ability to print on wide varieties of media from xerographic bond and card stock to transparencies and labels.