Fits Most Hair Dryers: Professional Diffuser Attachment Size Fits All Common Hair Dryers (Nozzle Diameter: 1.65" to 1.77") Function: Helps to distribute the heat and air of the hair dryer evenly, expands the heating area, avoids heat damage to the hair and maintains natural curls. Professional salon tool for finely curly and frizzy hair that dries and adds volume without frizz. So you can achieve the perfect hairstyle faster and better. FOLDING CONSTRUCTION: Make sure it is easier to put in a handbag or drawer, suitable for travel or at home. The lightweight silicone hair dryer diffuser is perfect for you. Heart-warming: The detachable filter allows the hair dryer to directly touch the hair. Essential oils are designed to give hair a natural scent.