Japanese only deluxe 2 CD SHM paper sleeve pressing. The SHM-CD [Super High Material CD] format features enhanced audio quality through the use of a special polycarbonate plastic. Using a process developed by JVC and Universal Music Japan discovered through the joint companies" research into LCD display manufacturing SHM-CDs feature improved transparency on the data side of the disc allowing for more accurate reading of CD data by the CD player laser head. SHM-CD format CDs are fully compatible with standard CD players.