So you lost a ball. Way to go. (Just kidding. It happens to the best of us.) If you lose a bocce ball or want extras, SeaTurtle Sports has your back. These replacement balls are the same ones that come in our full-sized and four-ball sets and are available in all four original colors. Each ball is, like its misplaced predecessor, made of tough synthetic polymers and injection-molded. Durable and shock resistant, these balls won’t crack, chip or rust. Balls are Petanque size (the French version of Bocce), which is 74 mm., or 3 in., in diameter.