Rule 6.03(c)(7)

Players are permitted to use reference cards during games so long as their use does not cause unnecessary delay to the game and there is no attempt made to alter the baseball using the card.

Was this article helpful?

Don't strike out!

Become a part of the largest baseball rules community in the world!

Get free access to baseball forums, rules analysis and exclusive email content from current and former Major League Baseball players and umpires.