This article is from the Miniatures Painting FAQ, by Brenda Klein email@example.com with numerous contributions by others.
Brushes come in a myriad of sizes and several different materials.
Sizes range from 1" to 20/0 or more. The more 0s the smaller the
brush, generally, however companies vary in size so the only true
scale is to look and compare.
Materials are sable, fox, camel hair (which is actually squirrel
tail, BTW), ox hair, and nylon. Round and flat are also available.
Red sable is the painters' choice, usually. A large brush for
primering and large areas, something between a 000 and 5/0 for
smaller areas, and anything from a 10/0 to a 20/0 for fine detail.
Drybrushing destroys good brushes so a couple camel hair for
drybrushing is a good idea.
Again, look at them before you buy. Make sure the tips are smooth
and end in a point and the sizes are right. A good brush retails
anywhere from $3 to $8, so it's a purchase to take time over.
Brushes are available at hobby and game shops, often at crafts
stores at a better price.