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@hippy
I've got both the Zipp Vuka Alu and Zipp Vuka Carbon bars. I bought them because I was being a bit of a tart - I can't imagine there's much of a performance difference though the shape of the carbon bars is presumably a little bit more aero than round tubes. I think they were a bit lighter but can't recall how much.
Straight gets you low for that aggressive aero position. 125 grams.
Vuka Race bend places the wrists at a more natural bend to help riders remain in their tuck to optimize aerodynamics. 135 grams.
Race Vuka Shift, features the innovative Race bend. What’s more, the Vuka Shift moves the shifter closer to the rider’s hand by almost and inch by mounting the shifter directly onto the extension, which helps allow riders to shift easily from their aerodynamic tuck. 145 grams.
https://mytriathlon.co.uk/zipp-aerobar-extension-vuka-carbon/
Zipp aluminum Vuka Alumina Evo provides the perfect fit for any rider, regardless of size or riding position. Vuka Alumina Evo are available with a 70mm (176g) or 110mm (180g) rise.
https://winstanleysbikes.co.uk/zipp-vuka-alumina-evo-bar-extensions
The Vuka Evo Carbon 70 or 110mm rise extensions, which weigh 140g and 142g respectively
https://winstanleysbikes.co.uk/zipp-vuka-vuka-carbon-evo-bar-extensions
So, yeah, feck all, like 20-40g.
You could save half of that by chopping your bars down under the arm pads.