Here are some examples of PLM (or Ejector) shotshells
They are my favorite ctges because they add to the sobriety of the brass the beauty of the paper color, this late one been better seen when the shells are NPE. (Another reason to collect NPE and not loaded shells !)
The metal can be brass or aluminium, the cases can be in one or two pieces, sometimes even coiled, the tube can have different lengths, the paper can have different color for the same gauge and manufacturer, and so on
They exist in the 4 to 32 gauges, plus special ones like for example the 28/30 Greener shown at the bottom left of the picture.
In order of enlarging my collection of such ctges, I would like to make trades with some people