US Patent Designed Large HP 88 CIS CISS for HP K550 K5400 L7750 L7780 L7680 L7700 Novel patant design and 100% reliable cartridge and continous ink supply system Large ink reservoir(160ml/color) for big save Siphon ink outlet located at top to prevent ink setting and nozzle clogging Auto-reset chip and detachable chip set to be easily installed or uninstalled Professional Technical Support.