Sorry, should have added that they have a rubber fitting way to do this.....
Yes, despite my initial scepticism about them. I now have a pair 😀, won' have a lot of chance to try them out but they do look good.
Slight critisim tho, the instructions said they were supplied with a 4 roller magnet, no it's the standard 2, also no mention of the little rubber gizmo to fix over speaker, it is fiddly but yes it does reduce the volume.... probably helps water ingress too?