Only time will tell of course but the ones that these are replacing were chrome and that just peels and stick in the pivots, but so far these are holding up nicely .... helpful hint to those using these.... although the metal composition is great, you'll still want to use teflon tape around the threads before you screw them into the inserts for a "no play at all scenario"
product worked as expected. big difference between these and the specials. glad i purchased. and even ordered gold ones for my other floyd rose tremolo.