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PERMANENT ART MARKERS: used for drawing, shading, sketching, designing, outlining, illustrating and rendering,Use these pens for coloring, comic,

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6 Colors Grayscale Art Marker Pen Double-Ended Sketch

12 Colors Grayscale Art Marker Pen Double-Ended

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6 Colors Grayscale Art Marker Pen Double-Ended Sketch

ADAXI 30 Colors Grayscale Markers Set, Alcohol Based Ink Neutral Gray Tones Art Supplies Dual Tip, Permanent Artist Markers Pen for Anime Portrait

6 Colors Grayscale Art Marker Pen Double-Ended Sketch

Tombow Dual Brush Pen Art Markers, Grayscale, 6-Pack