TWSBI Eco Indigo Blauw met Bronze Vulpen Nib size:Extra fine (EF) With its extra thick and Pen tip:Fine (F) With its extra thick and pleasantly soft 4B tip this ballpoint pen combines a deep black lacquer finish with refined chrome accents and the distinctive double ring Please note that the disassembly feature is for experienced users only and is not necessary for daily use ‘TWS’ are the reversed initials of the phrase ‘San Wen Tong’