Continuous Ink Supply Systems suit HP OFFICE-JET PRO 8100 | 8600 Cartridge Model: HP 950 951 / 950XL 951XL Printer Models: HP OFFICE-JET PRO Office-jet Pro 8100 ( N811 ) Office-jet Pro 8100 ( N811a ) Office-jet Pro 8600 ( N911a ) Office-jet Pro 8600 Plus ( N911g ) CISS ROBUST -V.4