88-note roll
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A standard piano roll for player pianos conforming with a specification agreed at the Buffalo Convention on 10 December 1908, where most of the largest U.S. manufacturers of player pianos agreed on common practices for several aspects of the instruments. The group settled on a width of 11.25 inches (286 mm) and perforation for 65-note rolls at 6 holes to the inch, and for 88-note rolls, 9 holes to the inch. Thereafter, a customer could buy a conforming player piano from any maker and buy standard 88-note rolls from any music shop, instead of being restricted to the rolls issued by the maker of their specific instrument.