Beechwood Thermo-NaturaIf hair is curly or frizzy, or if the hair is subject to chemical treatments like perms, dyes or bleach, the use of a normal thermic brush with nylon filaments can cause serious damage by drawing moisture from the hair which is already dehydrated. Specifically designed for dehydrated, dull, and rough hair, the Thermo Natura Brush, made with naturally anti static Beechwood, high quality Pure Boar bristles and an Aluminum barrel coated with Majolica