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Pet Supplies : Pet Toy Balls : Tuff Balls Pet Tennis Ball Size: 2.5" H x 2.5" W x 2.5" D : Amazon.com
All about tennis - Tennis balls were originally made of cloth strips stitched together with thread and stuffed with feathers. Modern tennis balls are made of hollow vulcanized rubber with a felt
Which of the following has more inertia, a bowling ball, a hammer, a feather, or a tennis ball? - Quora
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