I saw a set yesterday for the first time. They look very cool. The graphite should take the heat and seal very well. The parts store I was in had a sample of the material on the counter. The internals looked to be a mesh type fabric(could of been a fine steel wire). Sealing properties should be excellent on the first use. Im wondering about the reusable aspects. The sample I saw the graphite had started to crack. So if it cracks and flakes off I doubt it could reseal.
Jeff
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