Shannon Mylar Reel 1/4” x 2400', reel to reel tapes.
Both are used and there's no way to know what the tape is that is actually on the reel, especially since one reel has EMI on it.
Boxes have labels marked "Tape 5" and "Tape 6", inside the lid on one it says "2nd BBC Lecture", which may or may not be on the tape!