Brush pens are the best choice for creating brush lettering. The tip is a brush (rather than a firm felt tip). There are various brush pens from which to choose: slightly longer brushes (such as Twin Brush) and slightly shorter brushes (such as Faber Castel Artist Pen and Sakura Pigma Brush). See what works best for you; the different lengths produce text in different sizes. For the text in the picture, we used the pens (from the top down): Twin Brush, Artist Pen and Pigma Brush.