Faber-Castell Ambition Rhombus Rollerball PenThe clean lines and selected materials of these slim writing implements make an excellent impression. They are distinguished by clear cut visual design combined with professional functionalism. The barrel of this Ambition Black Rhombus Rollerball Pen is made of black resin, with a laborious guilloche engraving polished to a high gloss. Cap with a spring loaded metal clip pulls off and posts on the back end when writing. Ceramic rollerball refill with