Tombow Dual Brush Pens have two tips — a flexible brush tip and a fine-point, hard nylon tip. Both tips are fed from the same ink reservoir, ensuring exact color match. Tombow's odorless waterbased inks blend to create any color desired. With the flexible nylon fiber brush tip, you can achieve fine, medium, or bold brush strokes simply by changing the pressure on the point. The resilient tip springs back to hold its shape, stroke after stroke. With the hard nylon tip, you can create consistent lines, tight drawings, borders, copy markings, fine lettering, and more. Tips can be dipped in water to create subtle color washes. They're ideal for use with rubber stamps. Tombow Dual Brush Pens are 7¾" long (20 cm) with color-coded caps for quick selection. The brush nib and hard nib are at opposite ends, and the barrel's anti-roll design is perfect for busy artists. The pens are odorless, use non-toxic inks or pigments, and are acid-free .