This is a set of 20 Disk System disks. (Image 1 → Side A, Image 2 → Side B) I have only confirmed that these work. However, Disk Systems can be finicky, and some disks may or may not read depending on the system. Please consider this as a reference only. Please check the images for the condition. Everything in the images is included. I do not accept returns or complaints due to the risk of swapping, as disks may not read. They will be wrapped in cushioning material and shipped via Yu-Packet or Nekopos. If you would like images of the software in operation beforehand, please feel free to comment, and I will be happy to provide them. Thank you.