Made by HY (store in China that makes custom made bike parts), not Trek.

I ordered it for my Emonda and I didn't use it in the end.
Weight: 125g

Fit with Trek:
EMONDA SL/SLR
Checkpoint SL Gen 1 (2018~2021)
Madone Gen 3&Gen 4 (2011~2015)
Domane Gen 1&Gen 2 (2012~2019)

Description from the seller:
- Designed to provide superior stiffness
- 2 Titanium Screws & 7075 Alloy Top Clamp
- Carbon Cradle will absorb road shock to give you a performance advantage
- Fit with All Saddle Rail: 7mm Round, 9mm/10mm Oval
- Asymmetrical Clamp can be installed in 2 different directions to make it 15mm offset...