The DeSerres wash drawing paintbrush is made of natural bristles. Its oval shape ensures maximum water and color retention. The DeSerres wash drawing paintbrush is very soft and will not leave any traces on the page. It is ideal to create wash drawings on rather small surfaces. The DeSerres paintbrushes are an excellent value. Care: Caring for paintbrushes is essential to keeping them in good working condition and to their life span. Watercolors: dip the paintbrush in water and rinse in warm water. Acrylic: clean in soapy water and rinse in warm water. Practical information: Never let dry before cleaning. Using a hydrating paintbrush cleaner after using taltine or soap prevents bristles from drying and keeps the supple shape of the paintbrush.