Description:Half of a 24 pounder Confederate cannon ball cast with a core that created lines of weakness allowing it to break into consistent sized pieces. Commonly called a polygonal cavity cannon ball and also known as a Mallett Polygonal Cavity shell, this was a very effective design. It caused the shell to break into 12 equal pieces. This one has the diamond shaped pieces. I will include one of those frags with the purchase of this half shell.