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I think everyone has probably consciously thought about this at least once: it is a foot callus remover. I took pictures of the front and back. Just like your hands or your appearance, your feet are incredibly important, because they say the feet are the most fatigued part of the body.
First of all, the circular part on the front is large, so if you use it initially, dead skin cells will rub off effectively. Then, use the back side to finish gently. It is very rough, so you need to be careful with your hands. It also has a decent amount of weight, which is good because it allows it to rub better and provides a good grip. It is not plastic, but a material with a slight cushioning feel. When taking care of your heels, don't just apply cream; try using something like this as well.