What is making my dryer squeal when its drying,

What is making my dryer squeal when its drying,

what is making my dryer squeal when its drying, the belts are not frayed they look pretty good to me anyway but I am a girl I have seen frayed and cracked belts on my car and they look new compared to the ones that I have seen on my car and it doesn’t rumble it is a totally different noise and its not a constant sound its off and on

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