Originally Posted by gavna
...Totally useless if you are using poly or similar stiff strings....
I use them with poly on my PS85s and they definitely make some difference - mostly in softening the feel a little - marginally though. The times I've not used them the frame is definitely more tonky
Original Pro Staff 85, leaded to 370g, hybrid poly/syn gut set-up, 48-52-ish lbs.