The HP 335X high-yield black toner cartridge is designed for use with the LaserJet MFP M438, M440, M442, and M443 series, including specific models like the M438n, 442dn, and 443nda. With an extended capacity of 13,700 pages, this version is ideal for office environments where consistent text quality is needed for documents and printing volume is high. By choosing the 335X (W1335X) variant, you ensure a reliable supply of black ink and reduce the frequency of cartridge replacements, making it a more efficient choice for frequent printing tasks.