TDK Life on Record D Superior Normal Bias Audio Tape is a veteran member of the TDK family with a proven track record. Its ideally suited for everyday recording and applications where the same tape is frequently re-recorded and played. D is a workhorse - an all-purpose tape for your all-purpose world. Use it for dubbing, archiving vinyl, recording radio talk shows or capturing just about any audio source. TDK D cassettes are the worlds most versatile audio tapes. TDK Audio Tapes have earned the respect of recording engineers, musicians and home recording enthusiasts by delivering the worlds highest quality, most reliable cassettes. We utilize ultra-fine, high-sensitivity Super Finavinx metal magnetic particles to realize superlative audio fidelity.