1-1 of 1 Answer
Thank you for your question. The knobs for COS-305AGC is made of metal. The product components are sourced globally and the final assembly of the units is done in China. I hope this helps, if you have any further questions, please feel free to reach out to us directly at 1-888-784-3108. This answer is valid for this model as of 04/23/26.
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