This is 2-3 years old alloy. It is about 90g stem - can't remember, but as light as you can find and I have not seen any carbon that is ride-able lighter.
It is the ideal stiffness for the rider and has done some rough rides. I would likely not use it for Paris Roubaix, other than that great all around.
It is on the expensive side, but not as much as some composite ones. It uses T20 Ti bolts that require precise torque.
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