Multi-core cables are available in twisted cores or twisted pairs, upto 60 core or 40 pairs, Conductor :Single Multi-stranded Silver or Nickel Plated Copper, Core Insulation: Spirally wrapped & Fused PTFE, Conductor: Single Multi-stranded Silver or Nickel Plated Copper, Voltage rating: 250V, 600V, 1000V, Specifications: JSS 51038 MIL-DTL-27500H.