Dependable High-Quality Professional Audiocassettes. The Communicator, Duplicator, and Instant Start Series audiocassettes offer the consistency you require – backed by the Maxell reputation for excellence. For example, the cassette shells are manufactured to quality-control specifications that are 37% higher than industry standards. The leader tape gives you an exact 5-second cue at the start of the tape, as well as tape travel with direction arrows. The Instant Start Series is only available in 30-, 60-, and 90-minute lengths.