double2house, (6 x 100ml) Bulk 600ml refill ink for HP ink printer 6 colors C5100 C5180&nbsp;C6100&nbsp;C6150 C6180 C6200 C6240 C6250 Total 600ml ink(black, cyan, magenta, yellow, light cyan, light magenta) and 6 long needle syringes. No refill instruction. This ink is produced in dustless workshop & with third time filtration, particulate at size in 0.2. So the nozzle won't clog. This ink is Anti-UV dye ink, which can resist against sunshine so that printings can last longer in color. This ink was made with the color paste from USA and the chemical additive/formula supplied from Germany and Japan. Made in China. 100% compatible to HP printers. Each 100ml ink = 5~7 cartridges.