What is the name of that brush used when blow drying?

round barrel boar/bristle brush? Or do you mean the attachement to the dryer, the diffusserWhat is the name of that brush used when blow drying?
It's called a barrel brush or a round brush, I just call it a round brush it's simpler.What is the name of that brush used when blow drying?
A paddle brush? Or a round brush?
its a round brissel brush.