I ordered these to connect my loudspeaker wire to my amplifier by a Rhodium plated plug. I already had connected my loudspeakers with a set of Banana Plug Rhodium Plated OFC Copper Ø5mm. This was a step forward from the gold plated plugs I had before. Very clear and natural.
But these BFA Banana Plugs I bought now have a pin in the center. You can see it on the picture if you look closely.
My Linn amplifier has also a pin in the center of the loudspeaker terminals. So it doesn't match. A male to male connection. I have send them back.