The ink cartridge (LAMY T10) is fit into the pen barrel. It is comfortable and clean refilling. You attach the cartridge by screwing the fountain pen together.
The LAMY T10 ink cartridge is available in blue, black, red, turquoise, violet, blue-black and green. It also comes in special edition colors. For 2020, the LAMY T10 ink cartridge comes in a special edition mango color.