2.4GHz (and above) do not need very long antennas, so they have no need to spiral them to fit in a small space.
I am not even sure if you can call these rubber duckies - I
think "rubber duckies" refers specifically to the spiralled and flexible (springy) variety, but I might be wrong. I would just calls these whips.
Soldar: I had a hard time stripping the coax from one of these and connecting it to things, make sure to be gentle and have some spares.
EDIT:
just a tiny dipole fed at the center
Actually I might argue this is a monopole (whip) and not a dipole, as it's unbalanced fed. Ie little/no current should be in the shield. The folded metal sheath is more of a not-enough-space-so-lets-just-fold-it groundplane design. It's pretending to be flat