The microwave ring cover is usually made from heat-resistant plastic and often has small wheels or rollers spaced around it. Those rollers are what allow the glass turntable to rotate smoothly during heating. That spinning motion isn’t just for show—it helps spread microwave energy more evenly, so your food heats more consistently instead of coming out hot on one side and cold on the other. On top of that, the ring helps support the weight of the glass plate and whatever dish you place on it, keeping everything balanced and stable during cooking.
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