Includes OEM style hydraulic master cylinder, steel braided hose and aluminum hydraulic slave cylinder.  Makes the feel of the clutch smoother and more consistant.  Allows the use of stiffer clutch springs without increasing lever pull.  Black finish.   Yamaha uses a different thread on the left mirror that requires an adaptor to use other mirror perches.  It can be bought on Amazon for $6.   https://www.amazon.com/dp/B0CRGRG25Y?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1