"SureGrip 300 connectors use Direct-Gold or Direct-Silver Plating over our high-quality Purple 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 POM casing."

• Fits up to 9 AWG speaker cables.
  
• Fits 1/4″ – 5/16″ binding post.
  
• Cold-Weld System for an ideal connection, better sounding than solder: Tighten Allen-screws with supplied tool to create an ideal connection between plug and conductor, then slide the no-magnetic-interference ABS casing over the banana screw into place.
  
• Pure “Hanging” Gold plating directly over Purple Copper––no sound-damaging in-between nickel.
  
• High-Purity Purple Copper provides cleaner and clearer sound compared to lesser coppers or brass used in other “premium” connectors.