Free: Contests & Raffles.
So what's your question? Where to buy them or is it a good idea?
I shoot them on a 6 degree helical that my Arizona EZ fletch mini puts on them. I went through countless vane and angle configurations before I found this combination and they are wonderful. Slow the arrow down just a bit but they fly straight as hell now
Having it done at the shop is a little spendy.