Maxell Cassette Head Cleaner and Demagnetizer - Dry Type A-450 In many cases, over the long term use of your cassette recorder/player, tape particle contaminants and magnetic flux can accumulate on the tape heads and impair performance Economical one-step tape head cleaning with demagnetizing Restores music performance impaired by contaminants and magnetism build-up Dry but completely non-abrasive formulation Cleans in one minute, needs no batteries