These are on the expensive side, however they are teflon coated and therefore,noiseless. They are meant for 9/42 gauge, just like the original FR, and are very well balanced . I have used them for a floyd rose pro, and more recently on an edge pro , and they perform excellently,quietly, you don t get any of the rattling, fendery reverby noise.
So, if it wasnt for the price , i would say they are perfect, better than the ones that came with my edge pro (which are not noiseless,by the way). They operate very smoothly .