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 colour match. Tombow's odourless waterbased inks blend to create any colour desired. With the flexible nylon fibre brush tip, you can achieve fine, medium, or bold brush strokes by changing the pressure on the point. The resilient tip springs back to hold its shape. 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 colour washes. These are ideal for use with rubber stamps. Pens are 7 inches long (20 cm) with colour-coded caps for quick selection. The brush nib and hard nib are at opposite ends. Tombow Dual Brush Pens use no toxic inks or pigments, and are acid-free.