I have personally seen a dropped chain scratch the finish on a nice carbon frame as happened to my riding buddy. After that I started using them and now I have them on all four of my family's carbon road bikes. They are nicely made and match the bike, which is what I wanted. The only problem is that the stainless steel set screw is a very soft metal and you can tighten it once in place as the head rounds very easily. I ended up just buying better SS screws from the hardware store to replace them. Otherwise everything is good. If they're good enough for Peter Sagan to use, who am I for disagreeing!
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