Turbo Power Magnesium Thermic Booster BrushSize: 1 1\/4 (33 mm)Magnesium Thermic Booster Z.36A revolutionary thermal brush concept, with outstanding diffusion of heat to hair. The heating element is composed of 2.5mm diameter vertical rods in magnesium composite, with wide vents to channel the flow of hot air. The brush guarantees a level of performance that you have never experienced before. It will dry and straighten hair evenly and quickly.