Schmidt 888 Safety Ceramic Roller Pen Ink Refill 8 pack

I originally got these pen refills about 8 years ago to fill a regular G2 pen with something fancy but didn’t end up getting around to it. I have tested all eight in the lined paper—these are first swipes. They have not been used other than this test. Black ink. The pens read: Schmidt Safety Ceramic Roller, 888, F, 512, non-dry refill, made in Germany. Some of the letters is worn off. There is a card for Lanier pens.