A genuine Oki yellow drum unit is required by an Oki colour laser printer to store images at a high resolution. The yellow Oki 43381721 image drum works with the high definition low-melt Microfine yellow toner formulation to ensure fast, low-cost and high quality print outs. The Oki 43381721 yellow image drum can provide rich and accurate colours or sharper text on plain paper and select speciality media. When the Oki 43381721 drum cartridge has exceeded its life cycle, users need to replace it with a genuine product to ensure seamless operations. This replacement 43381721 yellow drum will extend the life of your laser printer for approximately 20,000 pages.