With no place safe to store my 21inch frame bike outside I had to put it inside the apartment. Be sure to allow the lips of the leather oval to cover mounting ring clips (you can sort this later) (PIC1)3) with one hand rotate earpad, with the index finger of the other hand , push down on the ring when inside the leather oval rim ensuring there is a clear indentation of the ring through the leather, about half a cm below rear stitching (PIC2)4) (PIC3) gently pull back leather oval rim of the pads so they are hooked inside each clip , with a flatsided screwdriver, ever so slightly pry the clip Sizes run large so I ordered 2 sizes down. I just returned from a trip to Europe that involved a lot of walking and these were perfect. The batteries last a while (I keep the volume about half-way, which makes normal conversation sound normal. (I really missed this feature with the Galaxy S9 plus. I bought this model basically to avoid having to change valve fittings. Reseting transmission DTC codes is a must to get it out of limp mode. Those are the ?two pieces,? which I guess is technically correct, but there was much to be desired when I opened the box. Ok - so you might be asking yourself is it worth the upgrade?I dont think so just yet.