Bobco, the speedflite vanes work great for broadheads. I picked up my first pack becuase of there recomendation to use them for Whisker Bisquit style rests. They surely work well for this. They only come in the 4" size, which is what I use and my broadhead groups are great. So good infact it is very costly to try and shoot groups and closer than 40 yards, and even at that I will manage to slice a vane off now and then. These are by far the best vanes I have found for use in the WB style rests.