TDK D60 Slimline EcoCase High Output High Precision Cassette Mechanism Blank Cassette Tapes - 7 Pack High Output High Precision Cassette Tape Mechanisms IEC I / Type I Normal Position Tapes 30 day money back guarantee Each cassette is in TDK's Slimline EcoCase - small box = less plastic Each cassette records 60 minutes (30 minutes per side)