Note these come with a disc that is 2 inches across that is aluminum that I have been told is ready for sublimation.  Note it has a ring that will have to be widen and removed to sublimate and then put back on.  They have a plastic film on both sides that will need to be removed prior to sublimating them.  Note these can also be laser or Vinyl instead as well.  They are also easy to remove if you do not want them on there.