Cassettes have been tested and work great! The product is a book titled "The Transpersonal Vision" by Stanislav Grof, published by Sounds true, Incorporated in 1998. It is an audio cassette book with a total of 145 pages and falls under the genres of Psychology and Body, Mind & Spirit. The book explores topics related to psychotherapy, general movements, and transpersonal experiences. The dimensions of the book are 9.3 inches in length, 1.4 inches in height, and 9.9 inches in width, with a weight of 22.4 ounces.