Lexmark T640 Return Programme 21K Toner Cartridge High Yield Black 64016HEIf you want a real all round toner that combines a high page yield, great quality, and environmental responsibility, then this is the cartridge for you. Designed for the T640, T642 and T644 printers, this toner provides crisp, sharp lines, giving fantastic definition no matter what it is that you want to print. The high yield up to 21,000 pages means you don't have to replace the cartridge too often. With a specific cartridge recycling programme, you