This is actually the new version of the pro vibe stem which finally got rid of the reserve faceplate with the two screws mount with a traditional four mount screws, which even though it is at the back of the stem, I found it more easier to tighten up the handlebar to the stem. With the old version you need to tighten each one equally because if you didn't I found that your handlebar would have slip it position.
Plus this new version is more 'aero' with the mounts at the back of the stem.
Lol, fair enough.
This is actually the new version of the pro vibe stem which finally got rid of the reserve faceplate with the two screws mount with a traditional four mount screws, which even though it is at the back of the stem, I found it more easier to tighten up the handlebar to the stem. With the old version you need to tighten each one equally because if you didn't I found that your handlebar would have slip it position.
Plus this new version is more 'aero' with the mounts at the back of the stem.