Perfect pen for professionals and students

I have been using G-tec pens since i was in 4th grade and now i am in college. It helps me improve my handwriting. It doesn't feel right when I use other pens.

Before discovering the Muji gel pens, I buy these Pilot G-Tec-C rolling ball gel pens because you can just get them from Amazon with no fuss. My preferred tip is 0.38 but they have 0.4 tip in this line instead which is good enough for me. I really like how the ink goes on paper but the only complaint I have about these pens is that they don't have refills for the pens compared to Muji pens. I would have to buy new pens from Pilot instead of re-using my pen shelves, which is not very ecological in long term. If Pilot sells refills for these gel pens, I will definitely give 5 stars to them.