Easy Flow Rollerball Refill Black Quantity Six. The 0113 Rollerball Refill is suitable for Most Waldmann Ballpoint Pens. Sometimes you do not want a rollerball with a cap, so this refill will fit in most of our ballpoint pens. Please note minimum order quantity for refills is qty 6. this is reflected in the price stated. When buying a Waldmann Rollerball, you will be able to order just one refill.