Thanks for the image !
I also had to look it up and was surprised to learn it was some idea of a weapon back in the Nam.
I have to be honest and say I never even heard of the things while there, but they are kind of cool looking.
Boy, you'd have to drop alot of those to have any effect where I was. It was all thick canopy jungle, no chance those little metal thingies would make it through. Those things would have been some mean shrapnel in a boobytrap. Sometimes our government is counter productive to say the least...