Faber-Castell D1 Mini Shake Pen Refill - BlueLength 67mm - Approximate line width = 0.4mm. This refill is suitable for Graf von Faber-Castell Pocket Pen, P'3140 Shake Pen, Pocket size and all Faber-Castell Multifunction pens. It also fits to any Mini Ballpoint pen. It comes in Medium point.