4 M; N2 Injected Dielectric Insulation For Ultra-low Signal Loss; Ultra-pure 6n Ofhc Copper Center Conductor For Accurate Signal Transfer; Precision-machined Rca Connectors With 24k Mil-spec Direct Gold-plated Contacts; Double-shielded Construction For Maximum Rejection Of Em & Rf Interference; 99.9999 % Lab-grade Pure Copper; Retail Packaging