my Mezz sigma is "wood" but I've heard there is a rod inside or something inside. It's heavy to me and when I draw it makes a sound like a carbon shaft.
I haven't been playing with it due to it's weight.
Here is the diagram on Mezz's site. It's the standard shaft for their entry level cue. Not bad at all shoots great but I just don't like the weight of it
Mezz has three Sigma shafts: Sigma, Sigma Slim, and Sigma Thick (E, Es, Et). You mentioned your Sigma was heavy ---it sounds like you got Sigma Thick.
As far as the shaft interior? It seems like Mezz's intention was to make a low-deflection wood shaft. It cored out a maple shaft and attached a vault-plate-like ferrule. Just as a carbon-fiber tube needs a vault plate --- so, too, does Mezz's cored-wood shaft. Some more whittling was done by making the shaft pro taper. All of this makes for a light---not a heavy--- shaft.
I am guessing the inside of the Sigma and Sigma Light shafts is foam --- just like the carbon fiber shafts. Sigma Thick's inside? Foam and weights (metal rods, plates, pins, weights?).
(By the way, why are Predator shafts shown on the Mezz's website https://mezzcue.com/en/products_pool/shafts ?)
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