TWSBI's belief is that it is important to allow the user to disassemble and reassemble the pen and completely experience the traditional aspects of owning and using a fountain pen. These pens also come packaged with a wrench and silicone grease. Neither of these accessories are intended to be used immediately, as they are for long-term care and maintenance. Additionally, please use extra care if you choose to disassemble the nib and feed, as the feed is very fragile.
The body of the pen is made up of plastic. The nib is made up of stainless steel. Screwed type mechanism. Piston-filler ink mechanism [note: ink is not included]. The body of the pen is transparent so you can easily check the ink level.
TWSBI, Fountain Pen - DIAMOND MINI CLASSIC.