Ampex reel to reel professional 641 - 1 mil. polyester 1/4" x 1000 feet seven inch reel audio tape from the 1970s.
The Osborne 04 Vixen computer was a small, light and cheap ($1298.00 in 1985) version with a floppy drive. This was the most popular version of the Osborne computers in 1985.