Hard tip for fine to broad lines when using more pressure. 0.25 mm to 1.5 mm lines. Kuretake Bimoji Brush Pens recreate the look and feel of traditional Japanese painting brushes with a modern twist. These brush pens are designed to resemble traditional bamboo brushes and are made with plastic bodies with black rubber grips and a hanging loop. The ink is a black, water-based pigment ink which is permanent, lightfast and waterproof and alcohol-proof when dry.