Natural hair from animal of the weasel family valued for its fineness and softness in fine painting with water colors and acrylics. Available as round brush, flat or bright for acrylics and water colors painting. To ensure hairs remain soft and supple, wash with Multifilla brush cleaner, hang to dry hair facing down. When dried you will feel bristles supplest and smoothness when rubbed between fingers. This much prevent hair breakages and loss.