This company makes fireworks for their own displays -- nothing you would shoot off in your back yard. They put on spectacular shows.
Their biggest rocket is 16 inches in diameter -- the same diameter as a battleship shell.
If you do shoot off 16 inch fireworks rockets in your back yard on New Years, let me know. I'll come down to hold your beer and watch.
If I could get my hands on one, I am just Redneck enough to set it off!
I did some work for the Grucci Bros. of Long Island back in the 90's. They used to do the Macy's Fireworks show in NYC. They were showing me what they do, explaining the dangers, etc. They told me that making the shells which give off a blue color were the most dangerous to make. I thought that was interesting, but if you watch a fireworks show, you don't see many blue colors.