Bio Ionic Universal Diffuser Black, , Diffusers for Women, The Bio Ionic Universal Diffuser Black diffuser helps you to create a textured hairstyle from the roots easily. Emphasise your curls and give them plenty of volume! Characteristics: defines waves and curls gives your hair volume guarantees even drying of hair prevents drying out and frizz How to use: Attach the diffuser to the appropriate hairdryer. When drying, place individual strands between the rounded tips and lift them gently.