There are many types of consumer fireworks in Brazil. One of the smallest is a firecracker commonly named "Traque".
This is what it looks like outside (it remembers a match!):
And inside:
As you can see, there's a little quantity of flash powder inside and the fuse is similar to a long match head ( a composition glued to a wood stick ). This fuse takes about 5 seconds to burn. Some people light them on hand and throw them, but I do not recommend that. The best way to light it is to put it in some place, light it and them walk away some meters.
I think the quantity of flash powder is not the same on every bomb, because some do a loud bang and others just a "puff".
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