Easy to installPackage of 6For use with Sheaffer VFM Matte Black Nickel-Plated Fountain Pen, sold separately..

This screw-in piston adapter allows Sheaffer fountain pens to use bottled ink. Fits all Sheaffer fountain pensNote: Does not fit Sheaffer VFM Series fountain pens.Allows Sheaffer fountain pens to use bottled ink in clear converterCompatible with all Sheaffer fountain pens except the VFM setThe screw action mechanism is very convenient..

Pack of 5 ink cartridges for blue fountain pens. Sheaffer fountain pen cartridges are proprietary, and only fit Sheaffer fountain pens that accept cartridges, except for the Sheaffer VFM fountain pen, which takes international cartridges...

It is a liquid ink that helps writing and smooth flow of ink to the paper available in a 50 ml bottle..