Some QIC format most likely - a fairly sturdy aluminium-backed cartridge containing two spools and a pressure roller with which the quarter-inch tape (hence the

Some QIC format most likely - a fairly sturdy aluminium-backed cartridge containing two spools and a pressure roller with which the quarter-inch tape (hence the name, Quarter Inch tape Cartridge) was pressed against the tape head. https://en.wikipedia.org/wiki/Quarter-inch_cartridge https://en.wikipedia.org/wiki/Quarter-inch_cartridge