A good quality un-terminated curly cable with a moulded plug like the one in the image. 2.5mm and 3.5mm plugs on single curly cable.
One pin is a standard 2.5mm mono plug. The other is a 3.5mm mono plug.
The tip of the 2.5mm is screened by the sleeve of the 2.5mm. The 3.5mm are unscreened. We have and even lower cost version of this cable without any screening.
Ideal as a replacement cable for headsets and speaker-mics or for connecting DIY audio devices.
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Please note these measurements are nominal please get in touch if you require more precise specifications.