Since they can quickly and quietly fracture the glass side windows on most cars ninja rocks have been used in smash and grab auto burglaries since at least 1995.
Ceramic spark plug break window.
While i have seen other people using the whole plug you only need the spark plug insulator the ceramic part.
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An article on the american ceramic society s website explains the hard ceramic fragments of broken spark plugs are great at breaking tempered glass.
They have no traditional association with the ninja or ninjutsu only being named.
In part 1 we learned porcelain from a spark plug can break glass but what about other porcelain like a toilet.
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.
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.
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.
Although effective spark plug fragments will not work all the time.
The ceramic stones are actually ceramic shards that come from spark plugs.
Spark plugs are made of aluminum oxide ceramic which is exceptionally hard.
These broken pieces are what you get when you smash the ceramic part of the spark plug.