Add a pop of vivid color to your papercraft projects with these primary pens from Marvy Uchida. These pens are perfect to make clean lines and strokes on everything from greeting cards and posters to envelopes and gift tags. Set includes black, blue, red and green.Details: Includes assorted primary colors0.3 mm extra fine tip4 pensQuick drying Smear resistant Water based ink Conforms to ASTM D-4236