A vinyl record is an analog sound storage medium consisting of a flat disc with an inscribed, modulated spiral groove. Their sound parameters and dimensions are set by international standards. Vinyl records are generally described by the size of their diameter (“12-inch”, “10-inch”, “7-inch”,etc.), the rotational speed at which they are played (“33 1/3” RPM or “45” RPM), and the weight of of the vinyl (“Standard” or “Heavy”).