Diamond infused ceramic. Volume. Natural boar bristles. Shine. No.1 Hairbrush brand (Source: IRI Scan Data based on dollar sales through 4/4/21). The heat from your blow-dryer activates the brush's diamond-infused ceramic. Achieve luxurious shine and smooth, healthy-looking hair as you style. Combination of boar and nylon bristles distributes scalp's own oils to leave hair silky and shiny. Smooth and straighten, medium to long hair or curl and wave hair.