Extend the Life of Your Favorite Pilot Advanced Ink Pen with an Acroball Ink Refill. Acroball’s advanced ink allows you to express yourself brilliantly with ultra-smooth, colorful, smear-resistant formula. This pack contains 2 refills made to fit Acroball PureWhite, Acroball Colors, Acroball Pro and EasyTouch Pro refillable pens. Pick up a pack today!