They look like the Leifstyle; the diameter is insufficient to fit the back of the speaker or amp receptacle as a banana would.
Nordost Red Dawn 2
I bought a pair of these cables used that are terminated by something that appeared like banana plugs in the photo, but aren't. They're cylinders cut at a 45° slant with diameters less than banana plugs. How do you connect them to amps and speakers?