These are no ordinary paint brushes. These are fine liner or 'pin line brushes' which are top quality. They have a long hand with a metal thrroat to hold the brush fibres in place and give greater control and precision. Designed originally for sign writers who needed extra fine lines, this brush is ideal for painting the finest details.  Great for hair painting or eyebrows on reborns or life like doll art.
Like any skill, this will take a little bit of practice to master. We would suggest trying it out on paper first to get the hang of the technique and just the right conisitency of paint.