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Why You Should Throw Tennis Balls Into the Drying Machine

If you ever walk by a laundry machine and hear strange banging noises coming from it, don't worry. There is most likely not a person or something absurdly large inside. It's probably just some tennis balls. Tennis balls are actually a very common way to ensure that large and fluffy items maintain their shape and don't come out of the dryer as a big lumpy mess.

The tennis balls help to even out the puffs of stuffing as the piece is drying, flattening what needs to be flattened and spreading everything out evenly.