One bike europe said this:
The after market kit includes amongst others carbon rear derailleur plates for RD-M970/971 (saving 11 grams), titanium cassette sprockets (saving 15 grams for a set of 17/20T), titanium bolts (-25 grams for the total set), a chain with hollow pins (-10 grams).
Here is the manufacturers website
The parts have a beautiful silver and gold finish and obvious functionality of appearance. If the parts are anything like the high end Shimano fishing reel I own then they are awesome!
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