According to ef (extremely fine) F (fine) M (medium) B (coarse), the thickness of different brands is different. For example, Japanese pens are generally thinner, while European and American pens are thicker, and even the same pen has individual differences.
I don't know the budget of the landlord. Ordinary college students first recommend hero 100 f tip, which is made in China and gold tip. It is affordable, and the online shopping 150 is comparable to the writing experience of foreign pens 1000 yuan. However, we still have to pick and choose, and the quality control of heroes is really not that good now.
Secondly, I recommend the German pen lamy safari. First-class quality, stylish appearance, but relatively thick. Ef tip can also write at ordinary times.
Again, Baile 78g, a Japanese pen, is cheap, about 30, and has a good reputation, but it is too thin. I think the M tip is too thin.
Picasso can only be regarded as the second-rate in China, with no special features.