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They have a separate section on their website describing their Microsilk, which is being used to produce ties.

https://boltthreads.com/technology/microsilk/ https://ties.boltthreads.com/

This is just speculation, but this looks to be in a “coming soon” state. They could be having any number of issues, including scaling, cost reduction, and the macro properties of the fabric may not have lived up to the early promises.

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