- Barrel diameter measures 7/8" and bristle diameter measures 2". The newest generation of the most advanced professional brush combining the latest ceramic technology with tourmaline ion technology. Combo brushes feature a special blend of ionic bristles and 100% boar bristles that create curls, add volume or straighten hair while eliminating frizz and flyaways for a smooth, shiny finish Large vents maximize airflow. The Ceramic coated barrel heats up faster and retains heat longer for faster and better styling. Tourmaline Ion Technology adds luster and sheen while smoothing hair. Unique Patented Design gives a snag-free neck ring and ergonomic comfort grip making styling effortless. Includes a retractable sectioning pick.