One of the secrets of painting miniatures is having a good brush which will last. This brush is made out of synthetic hair and can endure hundred of rinses and still keep a fine point. Paint types: acrylics, synthetic, oils.
The smaller brush sizes (e.g. 000) are used for buttons, eyes and other very fine details.
The larger brush sizes are used for undercoating, footplates, horses and other larger areas.