ESTON Compatible Hi-Yield Ink Cartridge for Dell Series 21 22 23 24 P513w P713w V313 V715w v515w (4 Black) Package contains : Black- 4 pcs compatible Dell 21 ink cartridges Compatible for Dell printer: Dell All-In-One Printers P513w P713w V313 V313w V515w V715w Page yield : Black: up to 550 pages at 5% coverage Easy to install and use with complete compatibility, outstanding performance All product have ISO9001 and MSDS certificate approved, all products are backed by 1 years full refund or free exchange guarantee for any damaged