Y.S. Park 602 Straight Shine Styler BrushY. S. Park Air Hole System is a system of small holes made along the center shaft (at the root of the bristles), allowing heated air to circulate through the entire brush, all the way to the bristle roots. This eliminates the build up of hair damaging heat pockets, and it reduces the time (and energy) spent on blow drying. Features include: Air holes Lightweight design 100% boar bristles Wooden handle