The blank cassette tapes have low noise surface which provides a suitable media for music and voice recording.Designed for Voice Recording | 60 Min Recording Time- Each tape provides 60 minutes of recording (30 minutes/side) and comes with a separate protective case | Cassette tape make for easy storage at home,Fits any Standard Audio Cassette Tape, great for new recording projects or for replacing broken cases to keep your collection safe, organized, and looking professional. | Suitable for a variety of machines,Excellent for personal and portable cassette players / recorders / tape decks | Great for everyday recording,voice voice lectures,all types of music,all can use with dictation equipment