What are cowbells when used in weight training exercise?

I cannot believe you asked that question! I recently got in the mail an advertisement for Cowbells, and I have never heard of them before. they are metal weights that look like cannon balls with a handle on them. and they are used like any other weights for weight training. wish I saved that paper now so I can share more with you. it even had a web site. go to google and type in cowbells for weight training and see what will come up.