INKUTEN HP 564XL HP564 Refillable ink Cartridges with with Chips + 4x 100ml Premium refill ink kit 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. This cartridge can be easily refilled and reused again and again. for Deskjet 3070a, Deskjet 3520 eAIO, Deskjet 3521, Deskjet 3522, Deskjet 3526, OfficeJet 4620, OfficeJet 4622, PhotoSmart B209a, PhotoSmart B210a, PhotoSmart B210b, PhotoSmart B210c, PhotoSmart B210e, PhotoSmart Plus All-in-One, PhotoSmart Plus e-AIO, PhotoSmart 5510, PhotoSmart 5511, PhotoSmart 5512, PhotoSmart 5514, PhotoSmart 5515, PhotoSmart 5520, PhotoSmart 5522, PhotoSmart 5524, PhotoSmart 5525, PhotoSmart 6510, PhotoSmart 6512, PhotoSmart 6515, PhotoSmart 6520, PhotoSmart 6525 Printers