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Robbing Piezos from my old Grey Ghost NDTs

Hello,everyone.
I have, what I believe are Audio Sears Piezos from my old GG NDTs.I'm planning to installing them into a new Set of Shells,for my Excal1000.(Waterproof them.)Temporarily hooked up they sound great.What purpose do those little Elements that are soldered into the Circuit(between the Positive and negative Terminals.) on the Piezos themselves.

They are Black,One appears to have a band of what appears to be a Copper Color on each End,the other side has One,with what appears to be Lipstick Red,although they are both faded badly,to tell for sure.
 

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Hello,everyone.
I have, what I believe are Audio Sears Piezos from my old GG NDTs.I'm planning to installing them into a new Set of Shells,for my Excal1000.(Waterproof them.)Temporarily hooked up they sound great.What purpose do those little Elements that are soldered into the Circuit(between the Positive and negative Terminals.) on the Piezos themselves.

They are Black,One appears to have a band of what appears to be a Copper Color on each End,the other side has One,with what appears to be Lipstick Red,although they are both faded badly,to tell for sure.
A LATE NOTE.. Hey I found this on the Audio Sears Web sight"This element is available with an optional click-suppressing varistor (P/N 2463V). The purpose of the varistor is to protect the users' hearing by limiting the maximum output of the earphone element, and is a uL requirement for some applications."So does this answer my Question? A Noise Limiter?
 
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