The Zebra Mildliner Pen is a double-ended pen that includes both a brush tip and a fine bullet tip. Filled with pigmented, waterbased ink, these pens are excellent for hand lettering, calligraphy, drawing, and design. The mild, translucent ink layers well and won't bleed through. Acid-free. - Zebra Mildliner Double Ended Brush Pens - Set of 15, Assorted ColorsZebra Mildliner Pens, 15 COLORS - Includes Blue, Blue Green, Brown, Dark Blue, Gold, Gray, Green, Magenta, Orange, Pink, Red, Smoke Blue, Violet, Vermilion, and Yellow.