Special brushes that feature empty barrels or reservoirs where water, or any water-soluble colour medium can be added. Gently squeezing the chamber allows the water, dye or ink to flow through to the brush head providing the artistic effect of a brush and the control of a pen. Suitable for use with many creative mediums such as dry and wet watercolours, charcoal, dyes, acrylic drawing inks, soft chalk pastels, watercolour markers and watercolour pencils.
