I read the reviews that this was a small diffuser, and I thought "Perfect! I just bought a blow dryer with an unusually small nozzle, so this will definitely work for me!"
It seemed like a perfect fit -- I pushed the diffuser firmly around my dryer and it seemed to hold just right. Then I started using it, and the diffuser started to slide off the nozzle...hard. I kept trying to get it to stay, but there was nothing I could do. Don't see the point in taping it on there like some have mentioned, since I don't diffuse every day. This is being returned.