I looked at the Benro HD3A head, but at 910g it sounded very heavy (significantly more than my camera, and the same as my Benro Tripod).
I saw that number also, but I find it difficult to believe. I'll try to weigh mine. Anyway, it's quite small and handy. And yet it's also quite solid and feels stable.
OK, do share the number when you weigh it.
Benro HD3A
This is on a finnicky Rhino Coffee scale, tared after adding the microfiber cloth of course. I would say reality would be plus/minus 10g. Probably the spec included the mounting plate, which I leave on a video camera.
As you may or may not be able to tell from the photo, the head does not seem large even on a small Benro FIF28C tripod (collapsed in photo). I bought the head to use for video, mostly, and I also didn't want the long handle.