Yosoo 40, 60 or 80 Assorted Colors Alcohol Oily Marker Pen Dual Brush Pen Art Markers Sketch Marker Pen Set with a Bag (White Body, 40-Color) Alcohol-based ink is pemranent and non-toxic; dries acid free For alcohol oily mark pen, pen tightly after use please cover to avoid ink evaporation Correct pull cap method, first pull out a little, so after re remove the pen cap into the air, if they feel tight can swing up and down at first and then pull the pen cap. Perfect for cartoon illustration, as well as fashion design Applies to: indoor, landscape, animation, product, industry, construction, environment art commonly used color and other design drawing