The Best Response so far was from a Chinese Girl who says:
"Aha, how funny!
It's Chinese for sure. And it's a herbal medicine ball! First of all, the
yellow ball is made of wax and keeps the moisture of the herbal content. I
can read from the package the black ball is for strengthening kidney. If you
are really curious, they usually cut the black ball into small pieces and
then swallow them with warm water.
I guess it belongs to a male...but it could be a joke. "
But thanks to Laura who asked a total stranger in a Asian grocery store about it-that takes balls :)