SEFS30 from Pentel is a brush pen with water based and very vibrant color. The brush tip is superthin and contains bristles made out of nylon.
Artist Brush Sign Pen
Pentel Arts Sign Pen Micro Brush
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Pentel Artist Brush Sign Pen - Red
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Pentel SESF30 °C AX Extra Fine Brush Tip, Black Pack of 12 : Everything Else
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Pentel Brush Sign Pen - Artist Ultra Fine
Pentel Arts Sign Pen Brush Tip, Black Ink