DRAWING PEN require for smoothing the raw sketch usually done by sharp pen. Luckily we got some sample in here. Like the marker, these drawing pens have their own size of tip too. Is always round or rather square, depend on which product you use. And that round or square tip has degree of its size, from 1-teen number for series. And for the smallest number of course has the very small line, or light, not too thick line produced. And its goes bigger by the rise of the numbers.
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