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. - Tombow Dual Brush Pens - Neutral Colors, Set of 20Tombow Dual Brush Pen, NEUTRALS 20CT - Includes Black, Burnt Sienna, Cool Gray 1, Cool Gray 3, Cool Gray 5, Cool Gray 6, Cool Gray 8, Cool Gray 10, Cool Gray 12, Dark Ochre, Lamp Black, Light Redwood, Sand, Saddle Brown, Sand, Warm Gray 1, Warm Gray 2, Warm Gray 5, and Warm Gray 8.