It is a strange pen whose thickness and density change with pen pressure. It may have a little analog flavor. 太さ、濃度が筆圧で変わる変なペンです。少しアナログ味があるかも。
If you set the pen pressure to extremely low, you can draw thin and dark lines. From there, if you further strengthen the pen pressure, you can draw thick and pale lines.
If you set the pen pressure to extremely strong, you can draw thick and dark lines.
It's pretty fun once you get used to it. ↓ Comparison of thickness and concentration by usage example and pen pressure

筆圧を極弱にすると細くて濃い線が描けます。そこからさらに筆圧を強くしていくと太くて淡い線が描けます。
筆圧を極強にすると太くて濃い線が描けます。
慣れたら結構楽しいです。↓使用例と筆圧による太さと濃度の比較
