The brushes had a very strong chemical smells very adhesive, so I had to leave them outside for several days after being cleaned for the smell fades, but maybe I had a bad series. Sellers are serious as they offered me if the smell was not going to send me a new game. When a daily use, say they have taken a hit through being left out so the "head "comes off the handle for some .. But otherwise no allergenic effect, and the hair is soft although sparse.