I've pulled one apart.
Here's the basic components.
10.5 grains of smokles ball powder
19.5mm x 6mm special wadd
17mm x 43mm cracker with 4 to 5 seconds of slow burn fuse
Cracker weight = 138 grains with glue and wad.
All in a standard looking hull.
As you may be able to see, the top of the cracker is sealed with hot glue.
The wad and fuse is also glued at the base with hot glue.
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Anyhow, I've put it back together and I've still got all my fingers