Equipped with a polished steel nib engraved with the TWSBI logo, the pen is available in a range of nib sizes, including fine, medium, broad, extra-fine, and stub 1.1mm. Its compact dimensions make it a perfect everyday carry:

Length: 117mm closed, 108mm open, 140mm posted
Max barrel diameter: 12.4mm; grip section tapers to 9.8mm
Weight: 18g

For perspective, the pen is roughly the height of an iPhone when capped and about 1 inch shorter than the Diamond 580 when compared. The end of the barrel is threaded to allow secure posting of the cap on the back of the pen. The posted cap length ensures a balanced and comfortable writing experience.
Key Features:

Piston-filling mechanism (not compatible with cartridges)
Entirely disassemble for cleaning and servicing (tools and instructions included; disassembly is for experienced users and at your own risk)
Supplied gift-boxed, making it an excellent gift for writing enthusiasts

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?)

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