Like Dairy King said, they do help with the adhesion of your vanes and feathers, and when you mess up a vane or feather there is virtually no glue to scrape off. They do help in visually seeing your arrow fly. I custom make my own wraps and prefer to have white ones especially for hunting so I can get a real good sense as to what type of blood is coming from the animal as to determine what vitals I hit. Another area where they help is in FOC. If your FOC is too high it will help lower your FOC into an aceptable range bu adding more weight to the back end. (about 8-10grains or so) But I personally think FOC is way overrated. But then lastly they can personalize and make your arrows look very cool. For those that like to be fashionable and have great looking arrows they are for you.