This information is found under another thread which does not have an obvious title. So, I am posting this thread to link to the one with the details which is found at:
http://www.diamondcut.com/vforum/showthread.php?t=2241
Note: K7 seems to be another designation for Cassette Tapes.
http://www.diamondcut.com/vforum/showthread.php?t=2241
Note: K7 seems to be another designation for Cassette Tapes.