Pentel Arts Brush Sign Pens Colour - Grey; Micro / Ultra-Fine Brush Tip. Dye Based, vibrant inks that are blendable & washable; Create a full hue & value range like watercolours. Ideal for calligraphy, comics, professional illustrations and drawings that require delicate techniques like miniature illustrations. Flexible synthetic brush tips that offer control & precision; Integrate seamlessly with Sign Pen Touch & other Pentel Brush products