This is a myth.
Ceramic window breaker.
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They have no traditional association with the ninja or ninjutsu only being named.
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.
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That s because it works on physics it works by inserting the credit card into the window channel top or side pulling and releasing.
I am failing to see how you think the ceramic will hit the glass first and cause it to break.
In terms of the window breaker always try to use the hammer around 2 3 inches from the edge of the car window where the glass is designed to shatter more easily.
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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Several people have suggested that the charge of the glass and the ceramic from the spark plug create a spark that breaks the glass in an explosive way.
Like a slug left over from punching a hole in a flywheel or hydraulic press.
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The only charge of any significance here is the one you ll pay to replace your window.
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Once the crack gets started it quickly spreads ceramic stones can easily be concealed by thieves.
The hard ceramic fragments of broken spark plugs are great at breaking tempered glass.
The reason is that the small sharp and hard ceramic fragments induce scratches that pierce through the residual stresses of the glass.
Even if the very top of the ceramic right below the tip called the terminal nut hits.
We had to give it a shot.
Spark plugs are made of aluminum oxide ceramic which is exceptionally hard.
Really any small piece of metal will do it.
Although effective spark plug fragments will not work all the time.
The ceramic could leave a scratch but that is all that would happen.
The shatters the window within a split second.
The ceramic is the insulator.
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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.