The RB series uses boar bristles combined with carbon fiber nylon for shine and control. An ergonomic rubber handle is combined with a Magnesium coated beech wood core that absorbs heat from the dryer and emits negative ions, protecting the hair cuticle from damage, while adding shine and maximum smoothness to the hair. The ceramic barrel smoothly transfers heat to the hair. This brush has heat resistant, ionic and anti-static properties. Made in Korea."