Includes: Compatible Toner Cartridge Replacement for HP 42A (Black) Compatible with: HP LaserJet 4250, HP LaserJet 4250dtn, HP LaserJet 4250tn, HP LaserJet 4250n, HP LaserJet 4250dtnsl, HP LaserJet 4350, HP LaserJet 4350dtn, HP LaserJet 4350dtnsl, HP LaserJet 4350n, HP LaserJet 4350tn Page Yield*: 10,000 For best results, store in a cool, dry place. Use within 3 years of purchase for optimal performance. Average printer cartridge Page Yield* in accordance with ISO 19752. *at 5% coverage (ISO/IEC standard) Color: Black Please contact us first with any product issues. We want all of our customers to be happy because happiness matters.