TM-toner &copy; 4 Reset Chips (1 SET)for HP Q6470A Q7580A Q7581A Q7582A Q7583A LaserJet 3800, 3800dn, 3800dtn, 3800n CP3505dn, CP3505n, CP3505x printer replacement reset chips HP LaserJet 3800, 3800dn, 3800dtn, 3800n CP3505dn, CP3505n, CP3505x printer 4 - Reset chip to insure your refilled cartridge is recognized and operates just like an original. (1 for each color)