Enbeam OM4 Multimode CST Armoured Fibre Optic Cable Loose Tube 24 Core 50/125 LSOH Eca Blue, part of a huge range of OM4 fibre optic cables fully stocked at Mayflex. Excel corrugated steel tape (CST) OM4 50/125 μm armoured loose tube optical fibre cables have been designed specifically for applications requiring a high degree of mechanical protection. These compact, lightweight cables are extremely rugged, provide rodent resistance and are quick and easy to install. The cables are constructed around a silica gel filled tube(s) containing up to 24 colour coded 250 μm buffered fibres, which is covered with E‐glass strength members. The CST cable has also been designed for direct burial, to ensure the correct installation a sand back fill must be used at all times.