The D79 is a Thermal Ceramic Straightening Brush. It has a vented design which allows heat from the dryer to circulate to the hair. The brush has a hinged handle which allows the user smooth and straighten the hair section by section. Starting at the root, simply take a section of damp hair and "clamp" the brush over the section. The vented brush design allows heat from the dryer to quickly dry the hair. The boar bristle is reinforced with nylon for better grip and control, as it smoothes and polishes the hair for enhanced shine.