With tip overlays, depending on the material, (Bone, G10 etc..) you can use Fastflight String. The difference between the two strings will simply amaze you. I know the difference changed my mind on all the bowstrings I will use from now on. Another advantage I've found is if you don't use tip protectors, you can always replace the overlay if it gets beat up. As Pat B said also, it simply makes the bow look a little better.