Please understand that this item has been stored at home for a long time. For those who understand, this is a high-performance, low-distortion cassette tape with a recording time of 90 minutes and a frequency response of 20Hz - 20kHz. - Brand: Konica - Model Name: KX-I 90 - Type: TYPE I - Recording Time: 90 minutes - Frequency Response: 20Hz - 20kHz - Bias: BIA 120μs EQ Thank you for looking.