Brother TZe-231 (TZ2-231) is the workhorse 12mm × 8m black-on-white laminated label tape — the most common size and colour for office, lab and retail labelling.
Brother TZe-231 / TZ2-231 12mm × 8m Black on White Tape is a Brother TZe laminated label-tape cartridge for compatible P-touch label makers. 12 mm wide × 8 m; Black on White. Confirm that your label-maker model supports this tape width before ordering.