Me again - new to this stuff. I am hanging out with a very mature magician and he keeps showing me stuff he accumulated. Today he said (as he often does) "I got this a while back. I've never used it. I don't remember what it is called and I don't have the instructions."

So, anyone know what this is called?

http://rikhall.com/ball_tubes.JPG

Thanks

Click here to view attached image.