Before every MLB game, the umpires rub six dozen brand new baseballs with Lena Blackburne Rubbing Mud, which comes from a secret location in New Jersey.  This "Magic Mud" takes the sheen off new balls so pitchers can get a better grip on them. 

Now you can buy an individual bag of the same mud used by every major and minor league team to rub down your brand new baseball wallet.  The mud will help break in your wallet by making the baseball leather softer and darker to give it a game-ready look.