Rollerball Refills 4 Pack of Superb Quality Refills. Designed to allow you to get the best out of your pen. Our liquid ink system gives a better writing feel than gel-based pens. Made in Germany. Schmidt 888 size means that these refills will fit the vast majority of rollerball pens that use a standard size refill. Medium Tip – Black Ink - Standard size ceramic tip roller ball refill by Liquid Ink Refill – Gives you the feel of a fountain pen with the convenience of a ballpoint Superb Quality Ink – The Medium tip provides a superb overall writing experience Made in Germany - Designed for Pens