The Derwent Waterbrushes are synthetic brushes with integrated water tank. Via the pressure you can control the amount of water running through the brush. They are very comfortable to use. But after a longer time the brushes get deformed and then you have to change them.
+ A handy water holder and brush in one for “en plein air” pursuits
+ water flows to the synthetic fiber tip via a leak-proof valve
– do not stay in form