While Compact Discs had launched in Japan in October 1982, it would take a few years for the new technology to become more affordable for the masses and for portable players to overcome their tendency to skip. By the late 1980s, however, the writing was on the wall: CDs were in and tapes were out.

But the CD-R was not a thing yet, and tapes were still the method for making mixes… and for making copies of CDs from music rental shops. As one of the major tape manufacturers, TDK decided to capitalize on this with a new lineup known as「CDing.」Though there was some variety, many cassette tapes of the time were limited to 46 minutes in length (23 minutes per side). This was not enough to make a copy of a CD, which were a maximum of 74 minutes long. The CDing line of tapes offered lengths of 50, 54, 60, 64, 70 and 74 minutes, allowing users to record an entire disc or make a longer mixtape. The tradeoff was that longer durations meant thinner tape that was more susceptible to stretching and breakage over time.

The advertisement here draws a comparison of this “perfect fit” for CDs with the form-fitting bodycon dress that was popular with stylish women of the time and would later become a staple of Japanese night clubs in the 1990s.