Can these pens be refilled with my own ink? Like other calligraphy pens that have a refill attachment you can fill with your own ink.

They can be made into eyedropper fill pens. The used cartridges can also be refilled carefully with a syringe (this is what I do), but if you are asking about the thing that looks like a converter, it isn't really one. It is just to clean the pen and does not fit snugly enough to use that way.

Is cartridge ink waterproof?

I am NOT sure if the ink is waterproof; If it is NOT on the package; then its absolutely NOT WATERPROO.

What convertor can I use with these pens? I don't' want to have to buy refill cartridges.

This one. Pilot Fountain Pen Converter (CON-50) https://www.amazon.com/dp/B0016YWJZ8/ref=cm_sw_r_cp_apa_MIIhzbDSPNCP8

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Pilot Parallel Calligraphy Pen Set, 2.4mm Nib with Black and Red Ink Cartridges (90051)

Product ID: 4258067

Details

Age Range (Description)
Ages 13+
Brand
PILOT
Color
Red/Blue
Ink Color
Assorted
Writing Instrument Form
Technical Pen

🎨Dual ink cartridges (black & red)

♻️Refillable & blendable ink system

✒️2.4mm precision nib

EC$74

Duties & taxes included

In stock

Sold byAmazon Saint Vincent and the GrenadinesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

✍️ Elevate your script, blend your style — calligraphy redefined.

DYNAMIC COLOR MIXING - Easily blend black and red inks for stunning ombre effects that elevate your creative projects.
COMPLETE CALLIGRAPHY KIT - Includes pen, black & red cartridges, pipette, and nib cleaner for effortless maintenance and peak performance.
REFILLABLE SUSTAINABLE - Eco-friendly design lets you swap cartridges and keep your pen performing like new.
SHARP VERSATILE NIB DESIGN - Dual parallel plates deliver crisp, expressive strokes from fine lines to bold calligraphy.
PERFECT FOR PROFESSIONALS CREATIVES - Ideal for bullet journaling, hand lettering, and artistic expression with trusted Pilot quality.

The Pilot Parallel Calligraphy Pen Set features a revolutionary 2.4mm nib with dual parallel plates for sharp, versatile strokes. It comes with black and red refillable ink cartridges that can be blended for unique color effects. Designed for artists, bullet journalers, and calligraphy enthusiasts, this set includes essential tools like a pipette and nib cleaner, ensuring long-lasting performance and creative freedom.

Specifications

ASIN	B002RJLS0S
Additional Features	Blendable, Refillable
Age Range Description	Ages 13+
Best Sellers Rank	#3,098 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #3 in Calligraphy Pens #32 in Drawing Pens
Body Shape	Round
Brand Name	PILOT
Closure Type	Retractable
Color	Red/Blue
Customer Reviews	4.6 4.6 out of 5 stars (5,909)
Drill Point	2.4mm
Global Trade Identification Number	00072838900517
Grip Type	Smooth
Included Components	Parallel Pen, Black Ink Cartridge, Red Ink Cartridge, Pipette, Nib Cleaner
Ink Base	Water
Ink Color	Assorted
Item Diameter	2.4 millimeters
Item Dimensions	7.83 x 2.5 x 0.63 inches
Item Type Name	Pilot Parallel Calligraphy Pen Set 2.4mm Nib - Black & Red Ink
Item Weight	22.68 g
Line Size	2.4mm
Manufacturer	Pilot Pen Corporation of America
Material Type	Plastic
Model Name	Pilot Parallel Calligraphy Pen Set 2.4mm Nib - Black & Red Ink
Model Number	90051
Recommended Uses For Product	Calligraphy
Style	2.4mm Nib
UPC	072838900517
Unit Count	1 Count
Warranty Description	No Warranty
Water Resistance Level	Not Water Resistant
Writing Instrument Form	Technical Pen

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