Very solid workmanship. Mugs will never break or wear out in my opinion (or it will last a very long time). They appear to be built for durability and reliability. The cups adhere well to the skin at all levels. You can have them suck at light, medium, or deep power. Using an oil or lotion will help these cups move more freely around the body. Regarding using mugs, I've watched videos and read articles. Enjoy. I do!
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