Inksky Inksky EMPTY Refillable cartridges FOR HP cartridge HP 364 5PCS FOR HP Printer models:Photosmart C5324 C5380 D5460 C6324 C6380 7510 7520 B8550 C309a C310a C410b C510 You can follow the choice"ok" after installing the cartridges,then the printer will show the ink level are empty,"grey" or "?" or "!", but the printer can be printed continuously. BK 30ML;C/M/Y 25ML can be refilled, 3 or 4 times bigger than original Direct Refill Cartridge can fill the ink directly, adopt creative design, filling ink easily: Fill ink full into cartridge by syringe, no use vacuum refill method, no need special filling tool and special technician Adopt no sponge structure, avoid break printer head becaus of sponge aging. Innovate it base on the first generation cartridge, make sure no leak ink, print spot, block when printing