4100ML continuous ink supply system CISS kit compatible for h 21 p 22 56 57 58 60 61 130 301 901 564 364 178 27/28 94 95 cartridge and printer with damper(TO Prevent backflow of ink ) CISS suit compatible for hp inkjet printer VOL:400ML,100ML/color Than the original printer supplies, saving 90% Recycling, may be filled with ink. With professional accessories. with damper(TO Prevent backflow of ink )