Genuine OEM HP Color LaserJet 5550n Toners

The Color LaserJet 5550n uses HP 645A toner alongside separate fuser and transfer kits. Toner supplies the printing powder; the Q3984A fuser bonds that powder to paper with heat. A fuser-maintenance warning therefore calls for the fuser kit, not another 645A cartridge.

Toner Buzz carries genuine HP 645A singles and the four-color toner set for the 5550n, plus Q3984A fuser and C9734B transfer kits. Pick the needed toner color individually, or order black, cyan, magenta, and yellow together in the set. Both maintenance kits remain separate from that toner order.