Great Compatibility: Fit with many blow dryers with nozzle 1.69-1.76in and 2.12in / 4.28-4.48cm and 5.38cm ( Please see the pictures for instructions of the blow dryers that would fit). The rubber base will stretch and hug your blow dryer. All you need is to push it down and make it snug. IMPORTANT NOTE: Blow dryers over 2000W with AC fans motor, DC motor or on high settings are not recommended for use with the diffuser. Please using the comb attachment on low heat/low speed setting at first. SAFETY CAUTION--The joint part of the comb attachment to the hair dryer is made of silica gel with thermal resistance temperature of 260 â (500 â). Sturdy and Heat-resistant: Made from heavy-duty material for long lasting use. Heat-resistant and sturdily-built without the frustrating issues of breaking or bending teeth. Dual Teeth Design: The black concentrates air flow to detangle and straighten your hair in 1 step. The small ,extra set of teeth at the base of the comb made all of the difference, your hair would be combed twice with each pass, making your hair super smooth and straight, cutting your styling time in half! Wide Applications: Work great to maintain straight hair, and also a great helper for the people with curly, natural, hair to straighten up their hair a little. Speeds up drying time on weaves, wigs & extensions, making your hair smooth and straight.Letter,PlainABS