The strings of some tennis rackets are made out of the skin of sheep intestines.

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Tennis Racket
Prince Bandit TT OS (6) by Jacky Cheong cc2.0

The first lawn tennis rackets had strings made of serosa, the elastic outer skin of sheep intestine. After World War II, sheep gut became scarce and so other materials were used. Today, however, some rackets still use sheep intestine. To make just one racket, the intestines of 11 sheep are used.

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