Extend the life of your Acroball® ballpoint pen. Advanced ink refills provide the same incredibly smooth-writing, quick-drying, smear-free writing performance that Acroball® ballpoint pens are known for. Steel ball-in-socket tips ensure seamless, like-new performance. Water-resistant ink. Refills are compatible with Acroball® PureWhite, Colors, Pro, BCA, 300 and 1000 pens. Refill Format: Ballpoint; Refill For Series: Pilot® Acroball® 300, 1000, BCA, Colors, Pro, PureWhite Ballpoint Pens; Refill Ink Color: Black; Color Family: Black.