Faber-Castell Pitt Artist Brush Pens offer a range of vibrant pigmented India ink in two distinct brush tips. The standard Brush Pen is slightly firmer and designed for medium-sized strokes, making it versatile for general use in calligraphy and illustration. The Soft Brush pen nibs are more flexible which allows it to expand or flex more when pressure is applied, creating broader strokes than the standard brush pen can achieve. - Faber-Castell Pitt Artist Pens - The Blues, Set of 7, Brush NibFaber Castell Pitt Artists Pen, BLUES 8CT - Includes one brush nib pen each of 153 Cobalt Turquoise, 154 Light Cobalt Turquoise, 148 Ice Blue, 146 Sky Blue, 120 Ultramarine, 143 Cobalt Blue, and 110 Phthalo Blue.