I was excited when I received my Cutter carbon handle bars. Reviews were good and they came in under weight at 175 grams for 40 cm. As I was installing them, I started to hear a cracking noise as I was tightening the bolts. I used a 5 NM Ritchey Torqkey Wrench and the bars started to fail before torqued to 5nm. May be hard to tell in the pics below, but there is a small bulging line where the carbon failed. Not sure if the one I had was just defective, but these will definitely be returned. I think I'll just stick with aluminum for peace of mind.