Don't know about the really big ones, but the smaller ones have silica sand inside. Apparently some have a silver wire as a fusible link, but I don't think that would be all that common.

Don't know about the really big ones, but the smaller ones have silica sand inside. Apparently some have a silver wire as a fusible link, but I don't think that would be all that common.
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I made with the big ones, it was good.( I don't say, that you have to do the same, there is a big risk, that everything will go sh*ty)
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