Inksky EMPTY Refillable Cartridges HP82# C4840/c4844 BK, C4911a C4912a C4913a FOR HP Printer models:Designjet 510 The refillable cartridges are in normal size and you can close the cartridge door after insert it. It's far more convenient than those long cartridges which is not look nicely and always have to take care of your kids from pulling it out and DRINK IT This is not CISS with piping or tubing, thus no need to worry about trapped bubbles and ink pressure It can be refilled BK 60ML;C/M/Y 30ML ink,3 or 4 times bigger than original