The Schneider Topball 850 blue 0.5mm rollerball refill delivers the smooth writing feel of liquid ink for your capped rollerball pens. Built in the standard euro-refill format with a 0.5mm stainless steel conical tip and quick-drying blue ink, it glides across paper without requiring much effort. The "cap-off" system prevents the ink from drying out even if the pen is left uncapped for several days. Indispensable for students and professionals who write quickly.