Rollerball with innovative Liquid-Ink technology and wear-resistant stainless steel tube tip, line width approx. 0.5 mm. Writing colour blue, black, red and green. An ink regulator controls the ink flow exactly and consistently from beginning to end, without blots or skips. The large ink reservoir has a level indicator and every drop of ink is used. The cap-off ink does not run dry even if the cap is removed for 2-3 days. The cap has a sturdy metal clip and fits neatly on the end of the barrel.