-. Binding : Office Product -. Feature : A smooth alternative to the free-flowing ink of a fountain pen with the convenience of a roller ball. / Gel ink writes smooth; exceptional lines. / Cross pen refills are guaranteed to provide high-quality writing / Sold as 2 refills per order. -. Label : Cross -. Manufacturer : Cross -. MPN : 8521 -. PackageQuantity : 1 -. PartNumber : 8521 -. ProductGroup : Office Product -. ProductTypeName : WRITING_INSTRUMENT -. Publisher : Cross -. Studio : Cross -. Title : Cross Selectip Gel Rollingball Pen Refill, Blue, 2 refills (8521)