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School G Sepia (NP40ASE-F) can be drawn with strong and weak lines, so you can draw thick lines without difficulty.
It is easy to apply to strong and weak lines, so you may need some use to control the strength and weakness.
When you use it, you wont find a pen that is as strong as you do.
Uses: Cartoon characters, effect lines.
Strong and weak lines (strong and thin line) means you can write thick or thin lines depending on the angle and pressure of the nib.

(From Amazon.co.jp)