I guess I really can't say, I mean the do what they do, hold the wire, look nice? They are coded red and blue at the base of the banana with a plastic ring that covers the base, are completely gold plated, knurled cap and body, looks like it can hold 10 or 8ga. wire from the side, maybe 12ga. through the top of the hollow screw cap. The cap itself does not put the pressure on the wire, there is a small solid cylinder that goes in first and the screw cap goes on top of that.