A piece of memorabilia that has been used in a professional sporting event. These items can include, but are not limited to: bats, jerseys, fielding gloves, batting gloves, bases, etc. Baseball memorabilia is typically ‘MLB authenticated’, which means that Major League Baseball guarantees the authenticity and provenance of the game-used items.

Game-used memorabilia are commonly used in relic cards (though not all relic card memorabilia is game-used).