I bought this for my HP printer after wasting £20 for PC Worlds ink cartridges to fit the printer. Don't buy anything from [...], as they will not work with the printer. Apparently the chip isn't recognized by the printer. I really am impressed tenfold with this handy all purpose black ink refill kit. After drilling a hole into my genuine but empty cartridge I injected with 20ml syringe the ink and sealed with bung plug (supplied in kit) Presto the HP printed off on its first attempt. I have now placed an order for the coloured ink refill kit. Bearing in mind the cost of one genuine HP Black cartridge 364 costs under £12, the 3 x 30 ml bottles and ink flush will save a whopping £36. Highly recommended, hence my top marks of 5 out of 5.