The TDK SM 30 Type II High Bias Cassette Tapes are a set of 9 sealed cassettes with a capacity of 30 minutes each. Manufactured in Japan in 1997, these cassette tapes are designed for long-run storage and are recordable. The jewel case packaging ensures the tapes are protected and organized. With the high bias characteristic, these cassette tapes are ideal for recording audio with a focus on capturing high-frequency sound, making them suitable for a variety of audio recording needs. A reliable choice for anyone looking for quality cassette tapes for their audio recording or storage needs.