They are thick like most that we buy, thus placing "covers CD" whose slices are "enough" high to properly read the labels (this is, from my point of view, more difficult for skinny).
They are transparent (so no black!) And strong enough.
Too bad it is so rare because they are the only ones, and when there are more, it may be long before the new stock is positive! So, if any, do not hesitate!
