SoundTech MC45 Microcassette Tapes,  45 Minute, 22.5 Minutes per side. Total 10 Professional Microcassettes (Replacement for Sony, Olympus, Maxell Micro Cassette) SoundTech MC45 Microcassette Tapes; Individually wrapped in a clear box 45 Minute, 22.5 minutes recording time per side. Replacement for Sony, Olympus, Maxell Micro Cassette Total 10 professional microcassettes Magnets are on top and bottom eliminating the need to flip the tape allowing complete erasure.