Get the blowout look without the blowout time. Sutra's Thermal Round Brush does it all. Strategically arranged bristles provide grip, allowing you to glide through the hair, creating volume, bounce and movement while smoothing the hair and removing frizz. As easy to use as a traditional hairbrush, it features a ceramic-coated barrel and advanced ionic heat technologies to help protect your hair from excessive heat damage. Barrel size of the Thermal Round Hot Brush is 1.5".