The corks are procured from the teams and are shaped and seated into the bottle stopper hardware via a sterling silver ring hallmarked with the event. A periodic wiping of the sterling to remove tarnish will keep it looking fresh.Each MLB artifact is authenticated under the auspices of the MLB Authentication Program and carries a uniquely numbered hologram that allows fans to verify their item at MLB.com/authentication. MLB Authenticators witness, log, and adhere holograms to each artifact that comes out of play. Authenticators are also in the locker rooms post-game to witness these celebrations. Thus the details of each cork collected is linked to a unique hologram number in this online database.The Major League Baseball Authentication Program is the most comprehensive league-wide memorabilia authentication initiative in professional sports. Since its launch in 2001, it has become the industry standard for game used sports authentication. MLB stations an authenticator at every game played throughout the season. This demonstrates a commitment to ensuring all game used artifacts are genuine. For more information, please visit Authentication.