There are four thicknesses, I started with 0.2mm and it holds up well. If it breaks I go for 0.3mm and so on for 0.5mm. I tied 2 hearing aids together using a medium washer as a weight to avoid losing. So far, so good. I lost a pair of hearing aids (expensive I think) and I think this will leave them dangling but tied. Hopefully it will be amazing value for money.
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