Nylon and bristle, popular style. I think it’s the largest style available. Wonderful condition, original owner. Just hurts my head to use! I think it’s the nylon bristles, so it’s been doing a lot of sitting around. The box grew legs and walked away, but it will be packaged with love and care. In terms of “cleaning it”, I’ve been using a rat tail comb; I’m not crazy with the little brush they give you.