In reply to Andy: (sorry forgot th quote button hehe)

The cases are 14mm which have two disk holders on each side. With a couple of envelopes and some posistioning, you can get the 6 disks in quite comfortably and save major shelf space.
Also here in SA, 6 disk covers are not the easiest to come by so we have to make do with what we have :)

btw -This set looks amazing on my shelf