Twsbi GO: A new challenge in the world of fountain pen with a special charging system that contributes to an affordable price contributes to easy handling and high writing quality.
Hood and handle made of transparent resin, semi-transparent body colour: smoke
Spring Loaded Piston Filling Refill System
To recharge, simply unscrew the pen, insert the pen into the ink and the nib moves the plunger that fills the fountain pen.
Nib: EF (ExtraFine) steel
A quick no brainer guide in choosing nib sizes in an overly complicated fountain pen world: If you write small, go with an EF
 For the normal writer, F is the most popular
 If you tend to lean on a bigger font, M will be perfect 
B is for statements!! Sign a check in B, write a header in B, do some coloring/shading in B
 Stub nibs are italic in writing style (have a special card or invitation to write?)