I think Mitsubishi is the most famous. Bai Le is of good quality, Zebra is cost-effective, and nothing else has been used.

Bai Le? Gel pen BL-P50? P500/P700？ A smooth stylus? Examination pen

Mitsubishi UM- 15 1 gel pen/fountain pen/Mitsubishi 0.38 fountain pen /0.38? Hmm?

Japanese zebra zebra JJ 15 press gel pen? JJ 15？ 0.5MM？ Hard Mao Mao pen

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