L-ink brand remanufactured ink and toner cartridges have long been synonymous with quality and efficiency in the printing consumables industry. All of our L-ink brand cartridges go through rigorous quality control and testing, and are certified ISO14001 and ISO9001Our L-ink brand remanufactured black inkjet cartridge offers a more economical option to the HP 21 original cartridge, without sacrificing quality and performance. You can safely rely on L-ink brand cartridges to deliver true-to-life photos, rich laser quality text, and sharp images without the risk of bleeding or smudging. Compatible Printer list for L-ink 21 ink cartridge:• PSC 1410• DeskJet 3747• 3910• 3915• 3920• 3930• 3940• D1311• D1320• D2320• D2400• F300• F310• F340• F350• F370• F380• F390• F2120• F2210• F4100• FAX 1250• OFFICEJET 4315• PSC 1401• PSC 1410V