INKUTEN Full Refillable Ink Cartridge Replace For HP932 HP933, Use For HP Officejet 6600 H711a H711g 6100 H611a 6700 H711n 7110 printer 4pcs Ink With New Generation chipset, guaranteed to work with ALL NEW firmware update; There are easy-refill hole and rubber plug on the top of each cartridge. It is very easy to remove the plug for ink refill and replace it back after refilled for the easy refilling. The cartridge is transparent. It is easy to view how much ink left to prevent from lack of ink to cause air bubbles or how much ink filled in to avoid overfill for easy operation. The prefilled ink cartridges can be used as regular ink cartridges for an easy using. Our refillable cartridges allow you easily refill your HP OfficeJet printer. Refilling these cartridges is as simple as 1-2-3. Simply remove the plug, simply inject the ink, simply replace the plug. That's all there is to it! This cartridge can be easily refilled and reused again and again. Compatible with Printers: OfficeJet 6100, OfficeJet 6600, OfficeJet 6700, OfficeJet 7110, OfficeJet 7610, OfficeJet 7612