The rotating hot air brush is a handy styling tool that combines a hair dryer, comb, and styling tool in one. Its round-shaped barrel aids in the creation of soft, loose curls as well as straight styles. There are two interchangeable spin brushes included with this Hot Air Styler. The barrel with a diameter of 1 1/2 inches is ideal for shorter bob length styles, layers, and fringes. The 2 inch diameter barrel is appropriate for shoulder length or longer hair. A genuine built-in negative ion generator releases 50% more ions to lock in moisture, making your hair healthier, softer, shiner, and more manageable.