TWSBI Eco clear fountain pen ballpoint pen The piston unit can be

The piston unit can be disassembled with an optional piston tool

Now there is this version in copper

The rings and the traditional beak-shaped clip are plated with 24 carat gold and the 18 carat bi-color gold nib is finished with rhodium

featuring a spindle that turns faster than the barrel’s end piece thanks to two distinct threads

The Kaweco Sport is used with ink cartridges or a converter so you can also fill your pen from a bottle

TWSBI Eco clear fountain pen ballpoint pen The piston unit can beDe TWSBI Eco is made of transparent plastic, which provides a wonderful view on the inside of the pen, the cap and piston mechanism are made of clear plastic. The pens character will change with every other color you fill it with. For the adventurous people, the pen is easy to take apart for servicing or cleaning. A key and silicone grease are provided with the pen.