This is the rare 135mm f2.8 K mount internal focus lens. It is prized for its image quality and must have some serious glass inside because it is surprisingly heavy.
This lens is in good condition with moderate wear. There seems to be something loose inside of the lens but I've taken it apart and put it back together and I'm not sure what it is. There are also a few very small marks on the front element, but they are minor and won't affect your image quality. Otherwise the lens is working well with clean glass and accurate autofocus. There is also an engraving on the body but it is only cosmetic.
Get a good deal on a nice lens! Caps are included.