用於在建築中繪製草圖,然後用較暗的線條固定的鋼筆。 Pen used for sketching in construction then firming up with darker lines.
筆在細細線和較粗的實線之間具有明顯的過渡。

用於在建築中繪製草圖,然後用較暗的線條固定。

Pen has a sharp transition between a light thin line and heavier solid line.

Used for sketching in construction then firming up with darker lines.
