The Filofax erasable ballpoint pen refill in blue (pack of 3) 149012 ensures your favorite pen never runs out of ink. Composed of 3 replacement leads with thermosensitive blue gel ink, these refills offer a continuous and smooth stroke that erases easily by rubbing. Installation in the pen is quick and mess-free. It is an essential consumable for students, teachers, and frequent users of Filofax erasable pens.