Assuming that you mean the paper strips commonly referred to as "cracker snaps", the answer is silver fulminate.
Yes, there are several brands that make wallets with snaps.
Mitt romney
Nabisco still make spiced wafers or ginger snaps?
probably not.
Uncle cracker
When the economy snaps back.
give it a cracker and rub its tummy
a cracker packer
The action of you pulling the Christmas cracker causes friction which creates a spark that ignites the gunpowder to make a BANG!!!
The term "cracker" likely originated with early European settlers in America, particularly in the southern regions. It may have been used to refer to the cracking sound made by the whips of cattle drivers, or to the cracking of corn used in cornbread, which was a staple food for many settlers. Over time, the term came to be associated with white settlers from the southern United States.
I think that has something to do with those jelly sex bracelets where a boy snaps the bracelet. Each color has their own meaning and if you are wearing that color you're willing to do it....