Just bought a dozen of Tune-A-Nocks F/S by Quality Archery Designs (ya' know those little green nocks) and was looking for some comments on these. Our local super store was selling them for about $2.00 per dozen and thought I would give them a try. Do they really give you another 4 fps, better arrow flight...bla bla bla??
Thanks

They fit my string a bit tighter than most others. Depending on what nocks you have before, you might see a few feet per second...I think that 4 Fps would be the extreme limit.