It looks like the cases are metallic and only the bullets are wooden.
Short range training rounds are what they are.
One of my great uncles was shot through the jaw side to side by a Japanese soldier with one of those on one of the pacific islands during WW II. Lost several molars and had to have wooden splinters pulled out of his gums and tongue, in addition to surgery on surrounding tissue.
The ones in the picture may or may not have powder in them.
Probably do, though.