That's because they work dear Mable. FOR REAL.
I've had some for 11 years. I recently took them out again while I do this weight loss thing.
I also have a behavior modification tape and a subliminal music tape. When I play the music tape on low I swear I'm not hungry for hours. It only has classical music on it.
30 mins. a day. You can also do your own suggestions.
At the height of my usage I could do it without the tape. My kids have commented on how my attitude has changed. I like that.
Good luck with it. I highly recommend hypnosis tapes.