The Orange chain tensioner pads on the cam chain and timing chain . I checked mine today, I have a 04 twin cam Softail . I have run 20/50 synthetic oil in it since it was new , The pads were only just barely marked by the chains. They have never been checked before today. I read a lot of post about guys with 20,000 or so miles on their bikers and these things failing, and ruining their motor . My bike has 39,980 miles on it , I was very pleased with the outcome of this little maintenance check. It sets my mind at ease.