Proraso Shaving Brush The Proraso Shaving Brush is made of natural bristle. This slick, professional brush which is slightly bigger than many other brushes on the market, will give you that edge for a professional shave. The natural hairs feel good on the skin and the large grip makes the brush nice and easy to handle. How to use: Make sure you submerge the brush into warm to hot water for about ten minutes before used, then hang your brush upside down to make sure the water drains. When the brush is cold (does not have to be completely dry) then it’s ready for use. Keep hanging your brush upside down after every use. This will stop your brush from rotting and bristles falling out and you can keep your brush for longer..