There were no instructions so I used them with the smooth side on the glass and the ribbed side on the basket like a flat table. While it was glued to 40-inch tempered glass, none stuck to the tabletop. In fact, they didn't add any protection for moving glass on the table. Maybe the seller will explain what I did wrong, or maybe they just don't work in my usual situation. In any case, I rate them as useless for now.
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