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May 19, 2019· Mobile device customers please scroll to bottom for ordering and more info. The Original Solid Copper Heat Diffuser and Defroster Plate – Invented by the BellaCopper Founders in 2001! - Accept no substitutes! 1/8th inch thick! made in the USA. All of our solid copper heat diffusers are a full 1/8th inch thick, 99.9% (0.999) pure.