Question: what sizes are vinyl records?
Answer: Phonograph records are generally described by their diameter in inches (12-inch, 10-inch, 7-inch) (although they were designed in Millimeters), the rotational speed in revolutions per minute (rpm) at which they are played (​8 1⁄3, ​16 2⁄3, ​33 1⁄3, 45, 78), and their time capacity, determined by their diameter and ...