Quality item with aluminium body and a good grip on the cord. There are 4 contacts in total.
I really wanted a GA mike plug but couldn't find one reasonably priced in the UK so I "bridged" the 2 middle rings with solder.
I also infilled the waist of the narrowist ring with thin copper wire and soldered over the top at the same time as I bridged the rings. It probably was a bit of overkill and may have been completely unnecessary but the plug is now fully compatible with my GA comms system.