Brazilian Blowout Round Boar Bristle Brush with Cork Handle Brazilian Blowout Original Products Light weight, wooden core, cork handle, 40% more bristle brush than others. A must have when using Brazilian Blowout Split End Repairing Treatment and Smoothing Treatment. The round brush they make is a combination of nylon and boars hair. This is designed this way as nylon helps to move through the hair easier while doing the blowout.