***You can NOT successfully refill the #4 OR #5 cartrdiges UNLESS you have an "A" after the cartridge number***
This Bulk Ink is compatible with the following Lexmark inkjet printers:
X2690 / X4690 / Z2390 / Z2490 Series
• 4 oz cyan, magenta & yellow inks
• 3 syringes, 3 needles, and 1 drill bit
• Provides approx. 16 refills per color
Note: Lexmark offers for sale two different versions of the same cartridge: The regular version (#4 / #5) is NOT refillable. It is the "Return" or "Rebate" cartridge you agree to return the empty cartridge to Lexmark. In return, Lexmark gives you a $5.00 discount off the cartridge. The "A" version (#4a / #5a) can easily be refilled. However, the price of the cartridge is roughly $5.00 higher than the regular version, so most people unknowingly buy the regular version.