The ZN-SPB165 is extremely easy to install: simply install it between the speaker and the adapter ring. The foldable body can be adapted to the speaker without cutting in depth. The protruding and foldable lip seals the gap between the speaker and the door trim and eliminates disturbing resonances. The silicone ZN-SPB165 seals the speaker opening reliably and is also extremely weather-resistant. The included pads are glued directly behind the speaker and effectively reduce reflections in the door. The delivery includes 2 pieces of moisture protection and 2 pcs. pads.