This whole item, issued by China National Philatelic Corporation, measures 7-3/8″ x 10-1/4″ x 1/8″.  Inside the cardboard sleeve (pictured here), there are four folios, captioned in Chinese and English, each with a mint stamp set and a maximum card, honouring one musician.  See our entries 488B and 488C for examples of one folio.  Being thoroughly modern, there is a QR code and website information on the back of each folio.  Grade: 1