Two Burroughs SP 3200 Reel Tapes

Two magnetic reel tapes with 1600BPI. BPI stands for bits per inch and it specifies the data density that a magnetic reel can hold.

References: http://en.wikipedia.org/wiki/BPI

Two Burroughs SP 3200 Reel Tape
Two Burroughs SP 3200 Reel Tape