Having bought these a few weeks ago, they turned out great.
They feel just the right amount of heavy with enough flexibility to reach the top of my head.
First the good part: the steel and the protection it provides is excellent, and it looks cool. The sleeve part even has a moving rivet for a bit of extra rotation. Movement is good.
Since the measurements were missing: total length when fully extended: 49 cm, from the point of the elbow to the sleeve: 32 cm, and from the elbow to the top 27cm.
Now for the bad: it is held on by 3 straps to your arm and not to any other armor piece, and the weight of the armor drags it down, so whenever your arms are facing downwards it slides down somewhat so you constantly try to push it back up. It needs a way to connect to the rest of your armor or it's just frustrating. The other bad part is that there are two metal hinges next to your sleeve, which snag with the "Mitten gauntlets 1.6mm" that I bought, drastically reducing the movement of the hands. If you buy this then do not pair it with gauntlets with an hour glass shape.