Nineteen 640MB MO disks, all unused. TDK = Unopened, in a set of 5 in a plastic case MITSUBISHI = Unopened, 1 disk TEIJIN = Opened, 1 disk SONY = Opened, 4 disks maxell = Opened, 8 disks Two plastic cases that can hold 6 disks each are included. A discount is available if you don't need the plastic cases. A discount is also available if you're okay with removing the unopened TDK disks from their plastic case. Thank you for looking.