Rule 1.17

Rule 1.17

Playing equipment including but not limited to the bases, pitcher’s plate, baseball, bats, uniforms, catcher’s mitts, first baseman’s gloves, infielders and outfielders gloves and protective helmets, as detailed in the provisions of this rule, shall not contain any undue commercialization of the product. Designations by the manufacturer on any such equipment must be in good taste as to the size and content of the manufacturer’s logo or the brand name of the item. The provisions of this Section 1.17 shall apply to professional leagues only.

NOTE: Manufacturers who plan innovative changes in baseball equipment for professional baseball leagues should submit same to the Official Playing Rules Committee prior to production.

DISCUSSION
Manufacturers' logos and placement are subject to the Collective Bargaining Agreement between the 30 Major League Clubs and the Major League Baseball Players Association.
http://mlb.mlb.com/pa/pdf/cba_english.pdf