Ensure that you never run out of ink with these Pilot Ball Pen Refills. Equipped with a 1.0 mm tip, the refills fit perfectly with other Pilot pens. These medium point pen refills contain good-quality black ink, which will work well on most writing surfaces. You can easily insert them into your pen to deliver smooth and clean text. The ballpoint refills have a transparent body that enables you to keep a track of the ink supply. These pen refills will be a smart addition to your office, home, shop or school stationery.