Watercolour brush pen with water-based ink, Soft and Flexible brush tip, Refillable, Non-toxic, Odourless, Xylene free. Works like real watercolour brushes. Colours can be spread with water and blended together. Shading effects can be obtained by dipping brush pen tip in water or tip to tip touching of tips to create a gradient effect. Ideal for illustrations, modern calligraphy, DIY, designing, manga, scrapbooking, journals, card-making, hand-lettering and others.