Get great results every time with this HP 11A Black Toner cartridge (Q6511A). Using an advanced toner formulation the consistently sized micro-sized particles produce accurately sharp text, smooth grayscales, and deep blacks for maximum efficiency.. Manufacturer Part No.: Q6511A, 11A . Colour: Black . Duty Cycle: Approx. 6,000 pages @ 5% average coverage . For use in HP Laserjet 2420 and 2430 printersPlease note this product is delivered direct from our supplier and may take a little longer to arrive.