They have no traditional association with the ninja or ninjutsu only being named.
Ceramic spark plug break window.
In part 1 we learned porcelain from a spark plug can break glass but what about other porcelain like a toilet.
We had to give it a shot.
While i have seen other people using the whole plug you only need the spark plug insulator the ceramic part.
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.
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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.
Does this only work on auto glass.
Although effective spark plug fragments will not work all the time.
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.
Spark plugs are made of aluminum oxide ceramic which is exceptionally hard.
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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.