Performance Plus Remanufactured HP21 Black Inkjet Cartridge (C9351AN #21) Performance Plus Remanufactured Cartridges equal Qualtity, Clear, Crisp Printing All cartridges are fully print tested Performance Plus+ replacement inkjet cartridges provide exceptional results everytime Superior photo quality imaging All cartridges are guaranteed to provide a combination of clear, crisp imaging and excellent results with satisfaction guaranteed