Toner Tech- High Yield Remanufactured OEM Toner Cartridge Replacement Set (Q6470a, Q6471a, Q6472a, Q6473a) for HP 501A/ HP 3600 Set (Complete Set) Best Seller in OEM Refurbished Cartridge Category. Made in the USA. 1% of All Sales Proceeds Goes to ConservationFund.org to Help With Environmental Projects in the USA. Original Cartridge Remanufactured To Original Specs and OEM Parts. Page Yield: Black 6,000/Color 4,000 at a 5% coverage. Compatible With: Hp Color LaserJet 3600, 3600n, 3600dn Series Printers.