Though various materials have been used for spark plug insulators through the years the current contender is aluminum oxide.
Aluminium oxide ceramic spark plug.
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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.
Selection of materials for both the electrodes and the insulator have consumed much research and development time and cost.
The electrodes in a spark plug typically consist of high nickel alloys while the insulator is generally made of aluminum oxide ceramic and the shell is made of steel wire.
They have no traditional association with the ninja or ninjutsu only being named.
Most spark plugs now use a 1 piece ceramic insulator made from purified alumina powder.
This modern day insulator provides many benefits over previous designs including superior insulation or thermal conductivity.
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.