High quality CHROME C-120 audio cassettes! Tested and records perfectly. Approximately 60:00 per side (the individual tapes vary from 116 to 124 minutes total). Chrome notch tabs IN cassette shell (Shape MK10) with anti-resonance bridge piece, graphite liners, 5-screws. Appears to be a high-end BASF Super Chrome or Chrome Extra. Comes with a heavy-duty vintage-style cassette case (CB-027). Many of the cassettes have the length marked with a grease pencil.