I keep thinking these were initially created for Apple computers, just a guess. But also expanded to many other systems, and for a PC
Listing price is for each, only one.
I don't think this is for modern systems anymore, but was great using them years ago.
If you have an external drive that uses these, it's rather nice to leave a CD in it for something you use frequently. It is very handy, in that, you don't need to touch the disk every time you wanted to use it.
Each one has some scratches, but is very close to the one I show in the picture. If you really want a picture of the one I will send, just ask, and can email you the picture.
These have been cleaned and very lightly lubed and have a smooth working action, no problems at all.
Order all 3, you will get a refund of, " $6.00 "
Tested, ok, made in USA, sent inside USA only using USPS.