Olivia Garden Ceramic + Ion Thermal Round 20Mm Black hair brush with tourmaline-ion technology provides the best protection against static electricity and quick and effective hair styling. With a ceramic barrel and optimized air flow that distributes heat evenly, as well as ion-charged nylon bristles, the brush allows for straight and shiny hair. The ergonomic handle provides maximum comfort and better control over the brush movement. Brush diameter is 20mm.