This is water brush pen is easy to use for watercoloring and has great water flow control. Just unscrew the brush tip, fill with water and your ready
6x Small Miniature Fine Tip Paint Brushes Pen for Acrylic Model Craft Watercolor
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Watercolor Brush Pens (20 / set) – Pencil Box Factory
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Derwent Push Button Waterbrush Assorted Set
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(ARTZ-8020): Assorted Tips - Durable nylon tips hold their shape and deliver fine, medium and bold strokes. Precise Water Flow - Innovative rubber
Arteza Refillable Water Brush Pens, Assorted Tips - 6 Pack
Colour & Water Brushes