Sony HF 90 High Fidelity Normal Bias Cassette - 90 min. 3-Pack New Sealed - See Pictures. The Sony HF 90 High Fidelity Normal Bias Cassette is a pack of three 90-minute cassette tapes designed for recording audio. Made by Sony, these cassette tapes offer high-quality sound recording capabilities and are suitable for various recording purposes. The Sony HF 90 tapes are known for their reliability and are ideal for use in audio recording devices that support cassette tapes. Shipped with USPS Ground Advantage. All orders normally ship out within 3 days. We are not responsible for any delays in transit caused by USPS.