AUDIOQUEST Banana Plug 4 Pack SureGrip 300 SilverAUDIOQUEST banana plug 4 pack. SureGrip 300, direct silver over beryllium copper. Allen tool included. DIRECT GOLD OVER BERYLLIUM COPPERSureGrip 300 connectors use Direct Gold Plating over our high quality Beryllium Copper base metal. SureGrip 300s use no underlying brass layers that would inevitably cause distortion and otherwise damage the sound. SureGrip 300s employ our effective Cold Weld attachment system and feature an attractive non metallic