I love these, and train with clubs all the time. Finely made and durable. Easy to load as well through the top screwed cap. For anyone wanting to know how to use these I made a workout video with them on my YouTube Channel: https://www.youtube.com/watch?v=y-KzXmeaZz8
I am not 100% on the usefulness of this Thor Hammer, It would probably be a little dangerous to load this thing up with weight and swing it around but it is extremely cool. The knurling on the handle is aggressive enough that I do not see it slipping through my hand on a swing. It would have been cool for them to put a wrist strap on it or to make the pommel a little bigger though. It will become very top heavy when it is loaded.