Conductor : 0.4,0.5,0.65 or 0.9 mm annealed copper,solid
Insulation : Polyethylene or Polypropylene
Pairs : Two insulated conductors twisted
Lay-up : Unit construction for cables more than 25 pairs. Concenteic for cables up to 25 pairs..
Core-covering : Non-hygroscopic tape with a high dielectric strength
Shield : Plastic coated Aluminium tape, thickness 0.2 mm laid on with overlap. The aluminium taps is corrugated for every size of cables.
Inner Sheath : Polyethylene (Black)
Armour : Galvanized steel wires
Outer Sheath : Polythylene (Black)