This is a set of Quad Lock's Stem Mount Pro, Damper, and Adapter. I tried to install it, but the stem shape didn't fit my bike, so I ended up not using it. (It has been opened, but is unused.) Stem Mount Pro (Retail Price: 15,400 yen) Damper (Retail Price: 4,290 yen) Adapter (Retail Price: 1,980 yen) Also, as a bonus, I'm including the wireless charging adapter for iPhone that I intended to use with it. It's the type that attaches with double-sided tape, so you might be able to reuse it if you can remove it carefully. Thank you for looking.