Decoupling element

Does anyone know what this decoupling element is called? I can not find it

At a guess I’d say they are mild steel balls?

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It looks something like a Finite Elemente product e.g. Ceraball/Cerabase et al – but I suspect what you’ve pictured is another similar product by a different brand?

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You can obviously see a mismatch between the decoupling materials.
Nordost have extensively used this method of decoupling various metals - along with many others.
Plenty of online research data available.

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It may be Finite Elemente Cerabases slimline

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A less efficient version of this:

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