Direct liquid type fiber tip pen which can understand ink remaining amount at a glance. “Lamella – system” prevents influence on ink by atmospheric pressure and temperature change, realizing a smooth writing comfort in an airplane. Pigment type ink use. ? “Lamella – System” … Adjust quickly the change of ink flow due to atmospheric pressure and temperature change with many layers of grooves (lamella -). You can write a smooth and stable line. ? Drafting compliant