A bit similar to the sticks you’re showing. It looks like a small kettlebell at the end of a metal stick
Discussion
Oh right! No, never, but im interested.
I was talking about it with a few people here. A mace with a 15 lbs kettlebell sounds like a brutal training. 15lbs is not much but like you said, all the force of the movement gets concentrated in the kettlebell. Seems like an excellent workout exercise