of rubber that is not easily biodegradable. Historically, tennis ball recycling has not existed. Balls from The Championships, Wimbledon are now recycled to provide field homes for the nationally threatened Eurasian harvest mouse. In literature The gift of tennis balls offered to Henry in Shakespeare's Henry V is portrayed as the final insult which re-ignites the Hundred Years' War between England and France. John Webster also refers to tennis balls in The Duchess of Malfi. References External links International Tennis Federation's history of the rules of the tennis ball ITF Grand Slam Rules:Section I:The Ball Balls Tennis equipment Spherical objects