This set includes five compatible Lexmark 521H high yield black toner cartridges, each designed to deliver up to 100,000 pages. These cartridges are manufactured with 100% new components and are an economical alternative to expensive OEM options. They are guaranteed to perform reliably with your Lexmark laser printer, providing high-quality printing results. Using compatible toner cartridges will not void your printer's warranty and is backed by our 100% Quality Satisfaction Guarantee.