These are 2005 Special Edition MiniDiscs from TDK:
Here they are with my trusty DR7:
They’re a slight variation on the HO series. The bottom two discs are the standard TDK “Fine” series. They’re good workhorse discs as they’re somewhat inexpensive, and I can write directly on the colored surface. The TDK’s are my first choice for field recording since they’re the most durable and least error-prone brand I’ve come across.
The one on the top right is an old HiSpace disc. Pretty as they are, the HiSpace discs (which are generally very cheap) can be hit-or-miss; the good ones last forever, while the bad ones die almost immediately.