(Lot Of 7) New Sealed Sony HF High Fidelity Normal Bias Cassette Tape 90 Minutes. The image shows a Sony HF 90 High Fidelity Normal Bias Audio Cassett

(Lot Of 7) New Sealed Sony HF High Fidelity Normal Bias Cassette Tape 90 Minutes. The image shows a Sony HF 90 High Fidelity Normal Bias Audio Cassette, a type of blank cassette tape designed for recording. Here's some information about this product: Type and Bias: It's a Type I, normal bias cassette, which means it uses a standard ferric oxide tape formulation and requires a specific bias setting on your cassette deck for optimal recording. Recording Capacity: The "90" indicates it has a 90-minute recording capacity, meaning 45 minutes per side. High Fidelity: The "High Fidelity" designation suggests it was designed for good audio quality for its type, comparable to other well-regarded Type I tapes like TDK D or Maxell UR. Availability: These tapes are no longer manufactured.