You don't save a lot of money by building your own arrows. But you get to choose your shafts,vanes,knocks and wraps. You also get a lot of personal satisfaction. And you can repair broken knocks and vanes. With a little time and effort you can make perfectly matched arrows. Unlike the mass produced ones you buy. Check the distance from the end of the vane to the begining of the knock on your current arrows and you will see what I mean. They will NOT be the same.