This water brush has a soft plastic barrel which can contain water. When you squeeze the barrel, water enters the bristles, thus eliminating the need for a separate water container.
122 mm × 18 mm
Product by Gekkoso
The bottle is a bit difficult to squeeze, but with practice it gets easy to use. Very nice for traveling, very easy to clean, colours don't transfer into the water dispenser which is great. Overall a great purchase.