The spikes are rubber, but this device is uncomfortable to use. It tickles a little at first, and then it reminds me to roll my feet on children's toys. I think the pressure spikes should help and I'll try again at some point (I have neuropathy) but I just didn't care. I don't like trading one pain for another. I'll say it's well done and I found it quite unusual to make something out of wood these days. I do not claim to understand the principle of acupressure and have not been recommended to try such a thing, so it can only be ignorance on my part.
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