I have a pair of copper Avid Single Digit TI levers and arms. I am guessing they are at least 8 years old. A little sloppy on the levers, but amazingly smooth. I have new levers but I just love these to much. My BB I was using was 3 years old. FSA Platinum Pro 118mm. Cracked on the shell and was still going until the bearings fell out when I took it out. I got my money out of it. I try to ride smooth, so things usually last me awhile.