10 PCS Package Portable Disposable Blue/Black Fountain Pen Ink 4 mm Bore Diameter Cartridge Refill LengthWith quick-drying ink, you dont have to worry about the words you just wrote will be wiped off or soiled your hands and clothes after a few seconds, it is not easy to block ink holes and leaks, it is a good assistant in your lifeSpecifications: Material: Natural Dye Color: Blue, Black Size: About 57mm / 2.24 inches in lengthPackage Contents 10 PCS Fountain Pen InkNote: 1. Please understand there may be 1-2 cm deviation exist.2. Due to the lighting and monitors, there are slight difference between the picture and the real item.Promise If the product has any quality problems, please feel free to contact us, we will help you solve the problem as quickly as possible.