High Quality Stranded OFC Wire (Oxygen-free Copper)25-FEET - PW-OFC1/0GA-5BK/20RD - The lower the gauge number, the thicker the wire. Thicker wire presents less resistance to current flow. EASY POLARITY IDENTIFICATION - This two color jacket allows for easy polarity identification. Making a polarity mistake could be damaging to your audio equipment. Allows free, wide and seamless adjustment of the required physical properties of this wire such as flexibility, elasticity, and impact resistance.