Only decent 0.5mm pen I could find. Why is majority of pens 0.7mm? : r/pens

Callisto Retractable Gel Ink Pens, Medium Point, 0.7 mm

Unique hatch-door-type pen clip design, up and down when you retract the pens. Patented silent pressing structure reduces distractions to others especially in quiet environment. Fine point 0.5mm bullet tip for vivid, precise and no-skip lines. Twin-ball tip greatly reduces the writing resistance, that gives a more stable and smoothly feeling. Special quick dry ink dries immediately after writing to effectively keep your hands and the paper clean, even lefties would love it.

WRITECH Gel Pens Fine Point: 0.5mm No Smear & Smudge Black Ink Pen Click for Journaling Sketching Drawing Notetaking Retractable Extra Finepoint

Twist-Erase® III Mechanical Pencil – Pentel of America, Ltd.

EnerGel RTX Refillable Liquid Gel Pen, 0.7mm, Blue Ink 3-pk

FourCandies 12Pack Pastel Gel Ink Pen Set, Cute Note

Pen Review: Sharpie S-Gel and Roller Pens - The Well-Appointed Desk

Sold as 8/Pack. Proven #1 Longest Writing Gel Ink Pen vs. the average of top gel ink brands. Super-smooth writing gel ink. Comfortable latex-free rubber grip. Retractable and refillable. G2 is proven to be the #1 longest writing gel ink pen vs. the average of top gel ink brands. Provides smooth, skip-free writing. Contoured rubber grip offers writing comfort and control. Great for everyone, especially people who write for a living. Retractable and refillable.

G2 Premium Retractable Gel Ink Pen, Assorted Inks, .7mm - 8 pack

Sold as 1 Dozen. Provides smooth, skip-free writing. Contoured rubber grip offers writing comfort and control. Great for everyone, especially people who write for a living. G2 is the longest writing gel ink pen (Independent ISO testing. Data on file with Pilot Corporation of America). Provides smooth, skip-free writing. Contoured rubber grip offers writing comfort and control. Great for everyone, especially people who write for a living. Retractable and refillable.

Pilot G2 Premium Gel Ink Pens, Fine Point (0.7mm), Red, 10-Count

uni ball Grip Rollerball Pens Micro Point 0.5 mm Blue Barrel Blue