Brother Black On Yellow Ptouch Ribbon 9mm x 8m - MK621BZ The M-K621BZ allows you to create high-quality labels that are sure to come in handy throughout your home. Available in various colour and width combinations, the small, compact cassette uses direct thermal printing (thats right, no ink) to make the image on the tape. This black on Yellow M-K621BZ labelling tape is compatible with any P-touch label printers that have the M tape logo printed on the cassette cover, and is a great organisational tool that can be used to label everything from files and folders to plug sockets and containers. Tested by Brother to ensure its as dependable as possible, the versatile M-K621BZ offers high quality output every time you print, to provide you with crisp, easily readable labels.