The ink bag is a disposable product, which is a tube filled with ink. It can be used by directly inserting the cover into the pen and can be discarded after using up the ink in the ink bag. Operating steps for ink bag installation: 1. Unscrew the pen, take out the used ink bag, and then take out the new ink bag from the ink bag box. There is a round bead in front of the new ink bag, which is hard and strong. Put the new ink bag into the removed pen and press it hard. If you can't press it, you can press it hard while slowly rotating, and finally you can install it with a beep.
The ink bag is a disposable product, which is a tube filled with ink. It can be used by directly inserting the cover into the pen and can be discarded after using up the ink in the ink bag. Operating steps for ink bag installation: 1. Unscrew the pen, take out the used ink bag, and then take out the new ink bag from the ink bag box. There is a round bead in front of the new ink bag, which is hard and strong. Put the new ink bag into the removed pen and press it hard. If you can't press it, you can press it hard while slowly rotating, and finally you can install it with a beep.