Thermic Booster Brush is crafted with magnesium vertical rods that act as a heating element. The rods provide exceptional diffusion of heat. The wide vents channel the flow of hot air to dry and straighten hair evenly and quickly. The brush guarantees a level of performance that you have never experienced before. Unique lightweight aluminum handles are coated with special textured, non-slip finish for extra control and comfort. 2" barrel.