A box of 6 Graf von Faber-Castell Cobalt Blue fountain pen ink cartridges. Graf von Faber-Castell Cobalt Blue fountain pen ink cartridges are standard short international size, and will fit most fountain pens that accept international cartridges. Please note that they will not fit in pens by Lamy, Sheaffer (except the VFM), Parker, Cross, Pilot, Sailor and many others that use proprietary cartridges.
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