What type of brush do the Genius Bar employees use to clean out the speaker holes on an iPhone?

I am trying to find out the type of brush or brush hairs that are used by Genius Bar employees to clean out the small holes of the speakers on our iPhones. The one time that I had a Genius Bar clean up the gentleman used a small silver so do you old handle with short brush chairs. Do you any genius bar employees know what type of brush this is? Thanks so much!!! I am trying to find out the type of brush or brush hairs that are used by Genius Bar employees to clean out the small holes of the speakers on our iPhones. The one time that I had a Genius Bar cleanup the gentleman used a small silver steeled handle with short bus chairs. Does know what type of brush is used? Thanks so much!