Assertion: tennis ball | /r/HasProperty | stuffed with bone
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text: Tennis balls in the 1400s were quite similar to the first tennis balls, butthey were stuffed with chalk, sand, sawdust, or earth.(Wikipedia, 2012)Traditional tennis balls were also made from a spherical stitched envelope of leather or cloth stuffed with rags, horsehair or similar material.(Incorporation, 2011)It was also composed of a mixture that seemed like putty and human hair.(Borlings, 2011)However, in 1470, Louis XI of France forbade the filling of tennis balls and said that they should be filled with high-quality leather.(Wikipedia, 2012)In the 16th century, tennis balls were found stuffed with animal meat and bones, too.