Probably 20 centimeters; otherwise, they would be raining "cigar rockets" down on Israel.
Now that was hilarious. You had me laughing so hard I literally had to be picked up off the floor. My gut actually hurts. The mental picture you painted was perfect. 20mm “cigar rockets” i.e. firecrackers falling out of the sky – If the current situation weren’t so serious, I’d still be laughing. Thanks for the humor!!!
Actually they're down to a bow and arrow.
They _are_ 20mm in diameter -- but they're 20 m long. And 3-staged.