Review (1/5): these are not like ones that you may have owned before
I have owned these types of brushes in the past, and have found them to be very convenient. I used to keep one in my briefcase. These, though, are not like ones that you may have owned before. They are heavily cost-reduced, and are made out of the chintziest plastic. So chintzy, in fact, that the hinges come apart when you try to fold them. The rubber that is used to hold the bristles in place has a strong odor like that of an automobile tire. You would be very justified to wonder what the manufacturer has used for materials, and whether or not they are harmful to your health. Shame on Amazon for allowing this substandard garbage on their website.