Refillable HP #88 (No. 88) C9386AN or No. 88 XL C9391AN Compatible cyan Ink Cartridge for Hewlett Packard Inkjet Printer C9391AN has twice amount of ink as C9386AN and twice amount of page yield. Other than that, the two cartridge models are interchangeable. This refillable cartridge can replace both C9386AN and C9391AN and is prefilled to the full capacity of C9391AN. With Auto Reset Chip* installed Easy to refill! Never run out ink! Save Money! For use with HP Printers: Hewlett Packard OfficeJet Pro K550, K5400 Hewlett Packard OfficeJet Pro K550tn, K550twn Hewlett Packard OfficeJet Pro K550 tn, K550 twn Hewlett Packard OfficeJet Pro K550dtn, K550dtwn Hewlett Packard OfficeJet Pro K550 dtn, K550 dtwn Hewlett Packard OfficeJet Pro L7500, L7550, L7580, L7590 Hewlett Packard OfficeJet Pro L7600, L7650, L7680, L7700, L7750, L7780 HP No. 88 XL (#88-XL or C9391AN) compatible ink cartridges (prefilled to full capacity with high quality American ink) Package include: 1 x Refillable HP C9391AN (also known as HP #88XL, HP 88-XL, HP No. 88 XL) Compatible high yield cyan ink cartridge, page yield up to 1210, 28ml cyan ink. 1 x syringe Detailed instructions (in English) * ISO9001 certified *Auto Reset Chip (ARC) is a smart chip that reset the ink level to full automatically when the ink is about to run out. You just refill the ink when there's a "ink low" warning, turn the printer off, wait a few seconds then turn it back on. The ink level will appear full again. This enables you to refill and reuse the cartridge again and again. The Advantages of Refillable Ink Cartridge over One time use Ink Cartridges High Quality of Refillable Cartridge easy refill directly from the refill hole. No Drill! No leak! No Mess! Great for all residential and business customers. Refill within 60 seconds! Anybody can do it! If you know how to use syringe to inject liquid into a small hole, you will be able to refill this cartridge with ease. Incredible savings compared to the cost of cartridges. Each refill cost less than 5 cents! Save 99% off your printing cost! Easy Installation. True system ready for "Plug & Play". Never run out of ink at that inconvenient moment! No need to go out in bad weather to get that tiny ink cartridge which is not only expensive but runs out quickly. No more Cartridges waste! Save the environment! No more un-use Ink waste! When one color runs out in a multicolor ink cartridge, usually you have to get a new cartridge and throw the whole cartridge away. Not any more! With our refillable cartridge, you just refill that color and drop the cartridge back into the printer. No more messy refills! Well, if you'd ever tried to refill an ink cartridge, you know how messy it can get. Not any more! With our cartridge, you don't need any tools besides the included syringes. Just unplug the empty ink chamber, use the syringe to draw the correct amount of ink of corresponding color, inject the ink into the chamber and monitor the ink level through the clear plastic window at the side of the cartridge, plug the refill hole and that's it.