INKUTEN - 4 Refillable Cartridges for HP 940 940XL Auto Reset Chips ARC (Pre-Filled) Dye ink - for use in OfficeJet Pro 8000, 8500, 8500a 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. This cartridge can be easily refilled and reused again and again. The prefilled ink cartridges can be used as regular ink cartridges for an easy using. INKUTEN offers free technical support for any questions you may have For use in the following printers: OfficeJet Pro 8000, OfficeJet Pro 8500, OfficeJet Pro 8500 Wireless, OfficeJet Pro 8500a, OfficeJet Pro 8500a Plus