I use them for 10 months on a pearl rhythm traveler, the skins are muffle heads: silent mesh skin.
It's really effectively on these skins are a little vibrating wands normal. In contrast to standard skin there is no interest.
J'tais a bit skeptical when it came out (another useless gadget) but I relativized.
Qualitprix good value if you do not dtruit acoustic drums because you can keep a very long time for training on silent or pad.
I do it again this choice by taking them with olives smaller and rounder.