NEW YORK (AP) — 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 big league balls after the league cracked down midseason on the use of illegal sticky substances used by pitchers to improve grip. MLB confirmed the trial to The Associated Press on Thursday.

MLB has been experimenting with tacky baseballs since at least 2016, when some where 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, as well as recent innovations like grip enhancers created for professional strongmen.