HP has recently launched a new ink cartridge called the HP 305.  It will not work with HP 304, HP 303, HP 302, or HP 301 ink cartridges so please make sure you only buy the cartridges that are already clearly marked in your printer.  HP has two different black ink cartridges in the HP 305 range. The standard capacity black ink cartridge has 2ml of ink inside whereas the HP 305XL black has 4ml inside. The standard capacity cartridge has a smaller sponge inside whereas the 305XL has a large sponge inside so it can hold more ink. There is another cartridge called the HP 307XL black which holds 10ml of ink BUT it will only work in HP ENVY printers so if your printer has DeskJet on it then do not buy it. When buying 305XL refilled ink cartridges please beware that some unscrupulous sellers are disguising standard capacity cartridges as XLs by simply putting an XL sticker over the top of the cartridge. We know this is happening industry wide unfortunately on marketplaces such as eBay and Amazon. However there is an easy way you can tell if you really have received an XL cartridge. Please see the image above. In a real XL cartridge you should be able to see a sponge in the lower holes or if difficult to see, just poke it with a toothpick. If you have received a small standard capacity cartridge advertised as an XL please contact eBay or Amazon customer services by opening a case or an A to Z claim. The seller will obviously try to wriggle out of it claiming it was an error however it's very obvious and these types of mistakes just don't happen with a reputable company. Just remember if the price is too good to be true, then it probably is. Ink Jungle ensures we only use the correct cartridge with the large sponge for the HP 305XL black refilled ink cartridges so customers can be assured of getting the real thing and they also come with a 1 year warranty for piece of mind.