I have to admit I was a bit disappointed with this product. According to the product description, it is made of rubber. I assumed it would be some harder and denser rubber, but it's plastic. The two sides connect together with an extension that fits into the corresponding hole on the other panel. The tabs and holes are not perfectly machined to fit properly. So one side is actually slightly higher than the other, indicating poor design and/or manufacturing. Perhaps the weight in use will cause the joint to connect and align the panels. But first you need to design it right. It contains no guidelines or instructions. The "foot card" shown in the product description is actually the image on the front of the product packaging. They should have included this card as a product insert. It's embarrassing to think the company expects users to hold the box to view the 'foot map'. I've included a photo at an angle to show the raised knots, both flat and thinner and larger knots. Overall, this is a decent foot acupressure pad. Not overwhelmed by the initial introduction to the product. It works correctly when it comes to creating raised knots for foot acupressure treatment. Fortunately, I have some knowledge of acupressure and reference materials are available to me. This product is rated from 3.5 to 3.75 stars.
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