SONY ES:1 Cassette Tape - 100 minutes recording time, set of 10. - Brand: SONY - Model: ES:1 - Tape Type: Cassette Tape - Quantity: 10 tapes - Special Features: 100 minutes recording time Thank you for viewing. AI wrote this much on its own. However, I don't really understand what to do with it. These are unopened. They seem to be in good condition, but... They belong to my family, and I have no idea about them... If you need them, please purchase them.