Although this is an old item, as it is unopened, we cannot guarantee the sound quality of the tape. We apologize for any inconvenience this may cause. This is a rare, unopened cassette tape by Mr. Oki, who first introduced modern yoga to Japan. It is a collector's item. Mr. Oki taught that by correcting daily life through yoga, one can create a better human being, achieve health, attain liberation, and reach a divine state. We handle items with care, but please understand that we accept no claims or returns. (We kindly ask you to carefully examine the photos before making a decision. Thank you very much.) Please note that there are damages due to age and discoloration, and the condition is not perfect.