|Compatibility||Standard Rollerball Pen|
|Number of Items||1/Pack|
when the cartridge reaches the end, but it is not yet empty, the ink quality decreases. But I mean, really for a long time. It is as if the cartridge was air in and you have to shake the pencil regularly to continue writing. I end up getting bored and I change cartridge. What makes for 6 cartridge I fully uses about 5. I intend to try another kind of cartridge soon, I think for the price the quality is not at the rendezvous.