They are a fairly new brand of healthy granola bars that come in peanut butter, chocolate chip, blueberry and strawberry flavors. You can go to the website to find stores in you area that carry them or you can send me your zip code and I will look for you :)
I'd say approx 6 centimeters. I took another picture of them next to a penny to give you a better idea but it won't let me post any more pics cause it is too near to the end of the auction. If you want to private msg me your email I can sent you the photo.