I bought some last year from Lancaster archery, I think they were bohning, this year I have tried to get custom ones made from a few different places, only got one email response so far... So if you really want to try them i would go with one of the bigger archery shops like lancaster or even cabelas. They have a pretty good selection. As to why to use them, as stated before they make your arrow more visible, and they add a nice custom look. Also depending on your setup they can help or hurt your FOC. And an added benefit, if you want to refletch your arrows, you can just soak them in hot water and the wrap peels off with the fletchings giving you a nice smooth, clean surface to work with.