This is just a simple model to add a larger colour marker to the Sennheiser EW-D/DX range of body packs. Slides over the rubber mount for the antenna (see attached picture's).

Can be lose depending on print settings/tolerances. Personally i just put a bit of blu-tack behind the ring to make the fit tighter but still able to be removed.

Am currently working on a similar marker for the older evolution wireless Sennheiser packs.