What Is the Transparent Material at the End of a Gel Pen Refill?

Article URL: https://unsharpen.com/follower-end-of-gel-pen-refill/

Comments URL: https://news.ycombinator.com/item?id=27015267

Points: 22

# Comments: 3

from Hacker News: Front Page https://ift.tt/2RfcTuo
via