Watercolour brush with water reservoir. This Water Brush Pen is practical and easy to use with it's reservoir. The pump system makes it easy to clean the brush's synthetic fibres with water. The medium-sized tip is ideal for producing detailed sketches, illustrations, calligraphy and subtle blends of colours. Ideal for travelling, art classes and improvised sketching, the Caran d'Ache brush with water reservoir is a modern complement to traditional watercolour brushes.