TAKLON until recently (say the last 20 years) all brushes were made from animal hair.
That is until the advent of synthetically made hair. The original examples were not so good but the later versions starting with the NEEF Robert Wade series of brushes are really quite amazing in their performance and reasonably priced. They offer a great point, great spring and precise control. A delight to use and suitable for all media particularly when brush marks are not required in the paint film. They do not carry as much colour as sable/squirrel but are a fraction of the price and offer great value.