Video of RDX SERIES:

Rockville High Performance Cables are designed to provide efficient signal transfer for every application. Our Nickel-Plated, OFC (Oxygen-free copper) conductors assure that you have enhanced signal clarity with every use. Shielded for Superior EMI and RFI rejection, Rockville High Performance Cables are an ideal choice for all your lighting connection needs.

True, real DMX cables must be 120 ohms. Rockville DMX cables meets this specification.
Microphone cables are a lower impedance (ohms), and the difference in capacitance and twisting ratio makes it terrible for DMX signals.

Be sure to buy true 120 ohm DMX cables from reputable brands such as Rockville, Chauvet, American DJ.

Features:

• Rockville RDX3M50  Black Nickel Plated 3-Pin Male-Female DMX Cable
  
• OFC Conductors for Enhanced Signal Clarity
• 3-Pin DMX XLR Connectors with Internal Strain Relief for Rugged Reliability
• Hi-density OFC Braided Shield for Superior EMI and RFI Rejection
• Impedance: 120 Ohm
• Length: 50 Ft