Hewlett Packard (HP) Q3972A yellow toner cartridge designed for the HP Colour LaserJet 2550L / 2550LN printers. Advanced toner formulation for crisp, sharp output every time and smart printing technology enables supplies status and usage information. Colour: Yellow Duty Cycle: Approximately 2,000 pages at 5% coverage Alternative Codes: HPQ3971A Manufacturer Reference: Q3972A