The brush head has different intigriert hard bristles, which are moved through the Silk-Epil 7 by a rotation movement back and forth, like principle of electric toothbrushes. The hardness of the bristles is optimally selected in my opinion, and can actually be used on any skin! My girlfriend loves the brush attachment very much and quite often uses it. For face I find the rotation power to be a little weak from the Silk-Epil 7 but for the Bürtse can also nothing.
CONCLUSION: A good brush their target met but only 4 out of 5 stars because it is a little too expensive and this one should go for hygienic reasons often. But wear this does not so fast.