2 to 12 fibre OM1, OM2, OM3, OM4 multimode or OS1/OS2 (ITU-T G.652D) singlemode 250 µm single loose tube metallic armoured external duct and direct burial cables with steel wire strength members, and Low Smoke Zero Halogen (LSZH) or polyethylene (PE) jacket. The single loose tube cable consists of 2 to 12, 250 µm optical fibres in a single gel filled loose tube with longitudinally applied water swellable tape, Corrugated Steel Tape (CST) armouring and black LSZH or PE jacket with radially opposed steel wire strength members.