You would be surprised to look at my vanes when I shoot 3" lol
best to destribe them is like this


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Exactly what this does is turn a 3" vane into a 4" vane without the extra grains. It does seem to make the arrow spine faster and stabilize faster. I am also presently testing them with blazers and so far they are shooting great actually my patter shrunk about a half inch compared to normally fletched Blazers. Do not try it with 4" vanes I thought it would make it more like a 5" which it seems to fly good but the whistle in flight. Later on today I will post some pics.

Trytan