DetailsThermic Booster Brush is crafted with magnesium vertical rods that act as a heating element. The rods provide exceptional diffusion of heat. The flat surfaces allows it to act like a paddle brush. The extra wide vents channel the flow of hot air to dry and straighten hair evenly and quickly. The curved edges allow you to rotate the brush to add curl or volume at the ends. Unique lightweight aluminum handles coated with special non-slip finish. 2.4"