TWSBI Eco T Saffron fountain pen

De 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 purple plastic.The pen’s 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. 
The TWSBI Eco T has a more pronounced triangular section, which assist in holding the pen correctly and also the piston knob is more triangular shaped.