SONY ES-IV 46 METAL Sony cassette tape, METAL type, employing Dynametal technology. Since this is a new, unopened item, its operation has not been confirmed. Also, due to long-term storage at home, please purchase only if you understand this. - Brand: SONY - Model: ES-IV 46 - Type: METAL - Features: DYNAMETAL - Country of Manufacture: Japan - Mechanism: Establiss Mechanism Thank you for viewing.