What is the nib size of pilot kakuno fine-nib fountain pen? is it #6 or #5 nib?

Neither. It uses the nib type common to the Kakuno, Plumix, Metro, Prera and Explorer. Possibly other models, but I can confirm those five are all interchangeable.

Is the ink in the included cartridge waterproof?

Water resistant Ink will smear but enough remain so you can tell what had been written

What other ink can I get for this pen?

You can use any ink! You can get a converter or you can save the cartridge, dry it out, then fill with a syringe or dropper from any Fountaun pen (not dip pen) ink bottle you like. Also you can get any cartridges that fit pilot pens. Good luck.

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✍️ Elevate your writing game with a pen that’s as smart as you are!

PLAYFUL CLARITY - Transparent barrel lets you see ink flow, paired with vibrant cap colors to match your style.
CREATIVE VERSATILITY - Ideal for bullet journaling, calligraphy, and everyday professional use.
ERGONOMIC HEX DESIGN - Comfortable hexagonal shape ensures fatigue-free writing during long creative sessions.
WRITE WITH PRECISION - Fine 0.3mm nib delivers crisp, clean lines for flawless notes and sketches.
BEGINNER FRIENDLY SMILEY - Nib features a smiley face guide to guarantee perfect pen angle every time.

The Pilot Kakuno Fountain Pen (Model 10819) combines beginner-friendly design with professional precision. Featuring a fine 0.3mm nib with a smiley face guide, a comfortable hexagonal grip, and a clear barrel with colorful caps, it’s perfect for creative professionals and journaling enthusiasts seeking style and function in one lightweight, 32g pen.

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Manufacturer	Pilot
Brand	Pilot
Model number	10819
Product Dimensions	6.86 x 20.57 x 15.75 cm; 32 g
Color	Clear
Closure	Retractable
Grip Type	Smooth
Pencil Lead Degree (Hardness)	1.0
Shape	hexagonal
Material Type	Plastic
Number of Items	1
Size	1 Count (Pack of 1)
Point Type	Fine
Line Size	0.3mm
Ink Color	Black,Pink,White
Manufacturer Part Number	10819
Item Weight	32 g

Pilot Kakuno Fountain Pen, Clear Barrel, Fine Nib (10819)

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