And very long shelf life. Especially their ammunition. Most all of their 7.62 X 39 MM and 7.62 X 54 MM ammunition came in vacuum sealed and soldered steel tins. Packed in very sturdy wooden crates. (Most all of the Eastern Bloc ammunition was produced to these specifications).
I had read most all of this ammunition was packaged to last a century or longer. All were loaded with Mercury based primers, even well into the late 80's. While corrosive, Mercury based primers have a much longer shelf life. And are more impervious to moisture.
I still have a few cases of the stuff I bought years ago for cheap. Today if you can find it, the price has gone off the chart. It's good, dependable ammo.