I had no idea so I stayed out of this one but..... I see the OP mentioned drying the brush on the towel ....... I have never touched a towel to my shaving brushes. I do 10, not 9, not 11, ten flips of the wrist , like snapping a whip to get the excess water out, hang the brush bristles down overnight to dry. Anyway ........ that's what I do.