Install a genuine OKI Image Drum in your B411 or B431 printer for renewed print performance up to 25,000 pages As you use your OKI laser printer, waste toner and wear and tear on parts can lead to reduced quality and poor output Installing a replacement imaging unit helps to renew your printer's mechanisms, leading to crisp blacks and vibrant colours OKI printers use a separate image drum and toner cartridge, which helps to keep costs down and save money per page