Empty Fillable Blank Paint Touch Up Pen Markers (Set of 36) - Fill with Your Own Art Acrylic, Oil and Water Base Paint, Auto Painting Clear-CoatPack of 36 Empty Aluminum Body Fillable Blank Paint Touch Up Pen Markers with Nibs. 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.). U. S. Art Supply's premium blank paint pen markers can be filled and used with most types of paint coatings and ink materials. They work excellent with Art