The TWSBI Mini is a smaller version of the popular Diamond 580 Fountain Pen. Although this pen appears small when closed, it features threads on the back, which makes it possible to screw the cap on the back. This brings the size of the pen up to a very comfortable length, and makes it great to carry in your pocket.
The Mini is a piston filling pen. This means that a converter is not required to use bottled ink with this pen. Instead, dipping the nib into a bottle of ink and turning the piston knob will suck ink directly into the body. This gives the pen an enormous ink capacity, and makes refilling the pen quite an enjoyable activity.
In terms of design, the body of this pen is faceted in an aesthetically pleasing diamond pattern. Apart from being a beautiful design, the clear body also makes it very easy to tell how much ink is left at a glance. It’s also great for showing off brightly coloured inks. Furthermore, steel nib is smooth and quite wet, and matches the accents well. These details make for a pen that looks great and performs just as well.
Additionally, if you’re a fan of this pen, a great accessory would be the TWSBI Diamond 50 ink bottle. After removing the nib, the Diamond Mini fountain pen can be attached directly to this bottle. This makes it very easy to achieve a complete fill.