There are many different shell designs out there used in Class C shells, and also there is some significant variation among Class B (1.3) shells as well. Here I take apart several different Class C shells to show you what is inside them and how they work.

1a - Crackling shell:

1b - Lift charge and fuse removed:

1c - Time fuse ignited by lift charge:

1d - Burst charge and stars:

1e - Time fuse that ignites burst charge:

2a - Outside of shell

2b - Lift charge removed. Notice there is both a time fuse and a quickmatch ignited by the lift charge:

2c - The quickmatch goes to some stars and powder on top, that causes the lit stars to shoot out as the shell is launching:

2d - Powder and stars from main shell break:

3a - Outside of shell. As you can see, the lift section looks very different:

3b - Lift charge removed:

3c - Rest of powder removed. Despite looking different on the outside, you can see it really isn't anything too different:

4a - Great Grizzly Predator shells:

4b - Outer casing removed:

4c - Here you can see it is just two shells stacked on top of each other, not one shell. Both have their own lift charge and they are connected by quickmatch to fire at the same time:

4d - Burst charge and stars removed:

5a - Great Grizzly canister shell:

5b - Lift charge removed:

5c - Inside shell. Notice two layers intended to create two layers of stars when it breaks in the air:

5d - All powder removed:

6a - Triple break shell. This is just one design for them, there is at least one more I know of but I didn't have any for pics:

6b - Outer tube opened:

6c - As you can see, the green fuse lights the quickmatch, which then lights the time fuse of the top two and the lift charge of the bottom shell (which lights the bottom shells time fuse as well):

6d - Everything separated for a better view:

6e - Powder from all three shells. As you can see, they are smaller and have more rice hulls than single and double break shells: