The TwinTone is a fiber tip pen with two tips for creating thinner or thicker lines. It has a bullet tip with approx. 0.8 mm line width and a sturdy fineliner tip with approx. 0.3mm line width. The ink is water-based and will not bleed through most papers. The TwinTone is perfect for bullet journaling, sketchnotes and doodling. Available in 36 colors and 3 different sets of 12.