Major League Baseball is experimenting with pre-tacked baseballs at some Triple-A games during the last stretch of the minor league season.

The test run could be a step toward updating the Major League balls after officials cracked down midseason on the use of illegal sticky substances used by pitchers.

MLB has been experimenting with tacky baseballs since at least 2016, when some were game-tested at the Arizona Fall League. Feedback from pitchers was generally unenthusiastic, but that was before the league upped its enforcement to prevent the use of long-used concoctions like a mix of sunscreen and rosin.