These are cheap for a reason! They are rubbish!! Brush heads covered in a waxy coating as other reviwers have stated but if you soak in hot water for a while it does come off. However they are not worth the effort, the bristles fall out very very easily, plus the bristle seems too long in my opinion, very difficult to paint with! Tried 3 from the pack, same issue with all of them, I shall be throwing them away and buying some different ones. Complete waste of money!!!