Although effective spark plug fragments will not work all the time.
Ceramic spark plug break window.
They have no traditional association with the ninja or ninjutsu only being named.
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.
An article on the american ceramic society s website explains the hard ceramic fragments of broken spark plugs are great at breaking tempered glass.
We had to give it a shot.
These broken pieces are what you get when you smash the ceramic part of the spark plug.
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In part 1 we learned porcelain from a spark plug can break glass but what about other porcelain like a toilet.
I wouldn t say breaking the car window with a plug is quiet.
The ceramic stones are actually ceramic shards that come from spark plugs.
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.
Does this only work on auto glass.
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.