These sidecurtain gaskets press onto the hardtop side windows flanges and cushion the windows when the doors are closed. They are slightly thicker than the originals, which helps close the multiple air gaps one often experiences when fitting side curtains to hardtops.
These make a big difference if you are using your car in cold weather and are perfect for all but a nationally judged concours car. And by the way, if you go for national concours judging, make it easier on yourself and leave your hardtop home anyway. You do not need removable optional equipment judged.
You get two gaskets cut to length, ready to install. Some trimming may be necessary depending on your particular car.