While there are some audiophiles who would argue that the stand material contributes to resonances, as a practical matter, I have never heard it, nor have any of my former listening panel colleagues at the National Research Council in Ottawa, when we did some blind bests using various supports for bookshelf speakers. In addition to wood and metal supports, we even included a stack of hard-bound books as speaker supports and heard no differences (for the record, they were a bound set of journals of the Acoustical Society of America that resided in a large bookcase in the NRC listening room).
While you certainly don't want any speaker stand to resonate, bookshelf speakers do not have strong enough or deep enough deep bass output to cause any audible resonances in a stand.
Stands with a hollow central support pillar, including Axiom's metal stands, can be filled with bags of sand, lead shot, or non-resonant material for increased stability as well as to guard against any possibility of resonances. If you look at the physics of it, any bass resonance in a stand that might result from a bookshelf speaker would be at such a low level that it would be undetectable with music playback.
Axiom Resident Expert