That is for telecommunications in railway installations, with excellent mechanical and electromagnétic protection.
Construction: Electrolytic Annealed copper Conductor of 0, 64 and 0, 90 mm
High-density polyethylene insulation color code according to attached table
Twisted by pairs Pair wiring in concentric layers
Aluminium-Polyester screen Copolymer sheet forming a watertight tube
Indoor Low Density polyethylene cover Corrugated Steel Tape Armor
Coating by an antihumidity thermoplastic compound Low Density polyethylene cover
Black Color Non-flame propagator according to EN60332-1-2/IEC60331-1-1