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Each blank paint pen holds up to 0.58 Ounce (17 ml) of your own paint media material. Each pen has a premium 4.5 mm (0.18 in.) diameter fine tip nib that produces a line width of 2.5 - 3.00 mm (0.10 - 0.12 in.) Art Supply's premium blank paint pen markers can be filled and used with most types of paint coatings and ink materials.
U.S. Art Supply - Empty Fillable Blank Paint Touch Up Pen Markers (Set of 6) - Fill with Your Own Art Acrylic, Oil and Water Base Paint, Auto Painting
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