The tape within this genuine Brother M-K231SBZ cartridge is black on white in colour, making it easily readable in most circumstances. All 4m of the original Brother MK231SBZ  tape measures 12mm in width, making it a perfect fit for the majority of items around our house or workplace.This Brother MK231SBZ tape cassette is an ideal organisational tool, and we are sure that you will be pleased with the look and durability of the labels it produces. The adhesive used on the tape within the Brother M-K231SBZ is incredibly strong, helping labels stick to most common surfaces with ease.