This is a compatible replacement for the Samsung SCX-4521D3 black laser toner cartridge, delivering up to 3,000 pages. Designed to work seamlessly with your Samsung SCX-4321 or SCX-4521 laser printer, this cartridge provides reliable and consistent print quality. As an economical alternative to the original Samsung cartridge, it offers significant savings without compromising on performance. The use of compatible toner cartridges does not void your printer's warranty, and it is backed by our 100% Quality Satisfaction Guarantee.