Never heard any sound from my practice tips. A loose fletch will flutter and whistle. I shot them last year and they are awesome heads. I did get some 125g Slick Tricks this year and I got them flying just like my Rages. Interchangable at this point. The only issue with the Rages is you must be dilligent to make sure they are locked in place on the o-ring. They can come loose, but I've never had one prematurely open on me, and I shoot the actual BH before the season not just the practice head.