Set of Four- Professional The Cortex Heat Activated Hairbrush collection features ion bristles to smooth and shine your hair as you blow dry A ceramic-infused thermal barrel eliminates frizz and speeds drying time to create silky, smooth and conditioned hair. The rubberized, non-slip handle offers comfortable grip and maximum styling control. Comes in 4 sizes including a 3.5", 3, 2.5, and 2 thermal round brush. Reduces Blow-Drying Time Purifies and removes odors from your hair Nano-Silver technology eliminates 99% of bacteria and fungi Ionic Tourmaline Ceramic Technology Non-slip comfort grip handle Light Weight Design Available in 4 size Rapid dry ceramic barrel