The bristles adopt advanced nylon material, high temperature resistant and antistatic,stiff enough to create tension when styling your hair, yet soft enough to avoid tangles. The nylon bristles can massage the scalp in a gently manner, enhance the elasticity of the hair root and also smooth your hair. The hair dryer brush comes with 6 different barrel diameter: Approx 19mm, 25mm, 32mm, 45mm, 53mm, 65mm to suit your different hair texture and curls. 19mm is designed for short hair (chin length and shorter), 25mm is designed for medium hair (chin length to collar bone), 32mm is designed for long hair (Collarbone length or longer), 45mm, 53mm and 65mm is designed for super long hair. The round hair brush handle is made of ABS, which has good anti-slip effect, helps prevent slipping and helps you maintain the tension you need for a perfect hairstyle;With ergonomic design, the round hair brush can fit comfortably in your hand.