Ox hair is a strong, resilient bristle which makes a good, economical face painting brush. Grimas ox hair brushes are flat with a straight top. The brushes have a red handle and the number indicates the approximate width in mm. You can cut the tip of the smaller brushes (R2 and R4) at an angle to make a finer tip.
The most popular size for beginners is R4. Larger sizes need practice to handle with confidence, but they do the job quicker.