Hey Mike, these are full size versions.
Three deliberate clicks take you from medium to thumbnail; to almost full size; to completely full size.
The short ones are the perfect size for the background for the tumblr you are using and look good with your yellow avatar. I like the others but have no idea what use they have. What I do know is you should have our own brand of undies. 😉
There are also raw files and layered photoshop files if you need them for anything.