Im not sure on the arrows, but I know on golf club shafts there are two methods of making them. One is wraping sheets of graphite which does create somewhat of a seam. The other is winding a graphite filament (filament wound shafts) which creates a perfectly round shaft with no seam. The idea is that the one without the seam will give better consistancy and will preform the same no matter how it is installed in the club head. Good qustion about the arrows though, I'm interested to see what you find out.