Produces clean, vibrant lines to get your writing noticed. Acid-free, archival quality ink is perfect for important documents. Zebra® delivers high-quality in a name you can trust. Quality and value are paramount to the products Zebra® manufactures. Every product undergoes vigorous quality assurance testing to guarantee writing performance and maintain the standards Zebra® customers have come to expect. Zebra® offers a selection of refills and accessories to complement and extend the life of the most popular Zebra® writing tools. The steel ballpoint F-series uses smooth, easy-glide ink for a more controlled writing experience. Refill Format: Standard Ballpoint; Refill For Series: Zebra® F-301® Ballpoint Pens, F-301A® Ballpoint Pens, F-301® Ultra Ballpoint Pens, F-402® Ballpoint Pens, Spiral Ballpoint Pens; Refill Ink Color: Black; Color Family: Black.