An article on the american ceramic society s website explains the hard ceramic fragments of broken spark plugs are great at breaking tempered glass.
Ceramic spark plug break window.
I wouldn t say breaking the car window with a plug is quiet.
The impact of the shard against the glass creates a tiny structural failing which rapidly spreads the tension through the rest of the screen causing it to break.
Ninja rocks are broken shards of spark plugs that are formed by smashing the ceramic portion of the spark plug with a hammer or other large object.
They have no traditional association with the ninja or ninjutsu only being named.
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While i have seen other people using the whole plug you only need the spark plug insulator the ceramic part.
The ceramic stones are actually ceramic shards that come from spark plugs.
We had to give it a shot.
When done right the spark plug shutters the glass immediately and since the tempered glass is designed to break with little noise not much noise is produced.
These broken pieces are what you get when you smash the ceramic part of the spark plug.
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Does this only work on auto glass.
Although effective spark plug fragments will not work all the time.