- Pack 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.).