This product is a fantastic way to get in shape. I have used it for a few days now and it is absolutely perfect. The product comes with a small booklet that lets you know about the many different types of exercises that can be done. I also used this resistance band with a few of the kids I train at soccer practice and they love it. The resistance band has one small stretch mark but other than that no sign of wear and tear. The black resistance band is definitely for people ages 14 and up.