Black Ink refill for all TW1 (Chablis) and BA1/BA2 (Bolt Action) pens. Medium rollerball. 1 Each. The Private Reserve Schmidt Easy Flow 9000 Ballpoint Pen Refill utilizes ink that has a lower viscosity than regular ballpoint ink. Creates ultra smooth and easy feel in writing with four times greater writing capacity than standard ballpoints. This ballpoint refill dramatically changes the way parker ballpoint refills write. It is a hybrid between the rollerball refills and ballpoint pen refills.