Compatible with: HP LaserJet: P4015dn, P4015n, P4015tn, P4015x, P4515n , P4515tn, P4515x, P4515xm Compatible Replacements Included: 4 CC364X / HP 64X Toner Cartridge Black / High Yield Delivers 24,000 pages just like the original P4014 compatible toner cartridge Average cartridge Page Yield* in accordance with ISO IEC 24711. *at 5% coverage (ISO/IEC standard) This is the high yield version of HP 64A / HP 64A compatible toner cartridge / standard yield Please contact us first with any product issues. We want all of our customers to be happy because happiness matters.