This brush is constructed using materials that retain heat in the core of the brush, which makes it easier to style the hair when blow drying. Ceramic eliminates frizz and emits negative ions that break down bacteria build-up. The heat-resistant bristle reduces static and seals the hair cuticle, limiting the damaging effects of excessive blow drying. One piece, glue-free design with no snagging neck ring and a rubberized handle. Choose from a variety of sizes. Please note: all our round hair brushes are measured by the diameter of their bristles, not barrel size.