Straight & Curl Styling Brush by Y.S. Park Model: 75TE2 ~Super Straight Styler~Features: Oval, air holes, lightweight, 100% boar bristles, wooden handle, 54X58MM2-in-1 Brush!! This oval shaped brush is the result of combining a large diameter brush (for straightening) and a regular brush (for adding curls). Y.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.