I don't know if those were the specific ones that I used, but I got a "polar bear kit" from someone in Yellowknife before going out for 6 weeks in coastal areas of Baffin Island where bears are frequent. It had slugs, rubber slugs and "bear bangers". I loaded 3 real slugs, 2 rubber slugs and two bear bangers in that order, so that they would feed cracker-cracker-rubber-rubber-slug-slug-slug. I tested the bangers first and found that they shot out about 50 yards with a "screaming" sound, then "popped". In a real "situation" you'd have to be careful not to shoot it past the bear and have it pop behind him. Personally, I'd prefer just to have straight blanks like the Kent Fieldtrial blanks or something like that instead of the bear bangers - then you can be sure that the big bang comes right from you and not somewhere else. Just be sure if you use these that you don't use them in a semi - it will probably not cycle them - great in a pump like most "bear defense" guns. I usually give the "non-gun" people in the camp those pen-style banger launchers, which fit easily in a shirt pocket and are easy to use. Better than all of these options though, I also usually hire my Inuit friend to come out with me to watch my back - he knows much better to me how to "read" what a bear is going to do and how to deal with it. I know that I sure as hell sleep much better when he's in camp! I've shot over bears a few times to get them on the move, but the only time that I ever had to deal with a real "problem bear" that would not take "no" for an answer I was sharing a camp with an Inuit family and they took care of it by chasing it with ATVs and shooting 2 boxes of .303 rounds at him.
-DW