Dell Series 31 Black Ink Cartridge for Dell V525w/ V725w All-in-One Wireless Inkjet Printer (Single Pack) Dell Series 31 Black Ink Cartridge is designed for the Dell V525w/ V725w All-in-One Wireless Inkjet Printers. Dell Series 31 Ink Cartridges 1 Black MYVXX is compatible with the following machines : Dell All-in-One Machines V525w, V725w, Dell Inkjet Printers V525w, V725w.