Ink cartridge lets you print up to six reams of paper without changing ink. Epson's revolutionary, DuraBrite Ultra Ink produces smudge-resistant, fade-resistant and water-resistant prints that look brilliant on both plain and glossy photo paper. Ink cartridge is designed for use with Epson WorkForce Pro WP-4520, WP-4533 and WP-4590 Network Multifunction Printers and WorkForce Pro WP-4010, WP-4023 and WP-4090 Network Printers. Cartridge yields approximately 3,400 ISO pages.