Since the Return Pin is a very Low Mass design to make it from Harden Copper would not give the strength or the durability needed for soldering and everyday use.Being Made form Tellurium Copper maintains the strength needed to last for years and years.
The Housing is now made from Aluminium. When we first started making the original Bullet we did not have to worry about all the EMI radiation that is floating around our Audio Systems. But today with all the processors and switching power supplies that are used our Audio Systems are in a bath of noise.
So we have changed over to Aluminium as it has very good EMI/RF noise rejection so to keep your signal as clean as it possibly can be.
The LINK RCA now has twin strain relief screws to keep your cable and the connection away from all the plugging and pulling stress.