Fiber Optic Cable, Gel-Filled Indoor-Outdoor Loose Tube, 12 Fibers, 50/125 Multi-mode, PVC Jacketed Aluminum-Interlocked Armour (AIA), CSA, Riser FT4. Flame-rated and crush resistant loose tube cable designs provide unsurpassed performance for applications requiring premium mechanical protection to cross floors in multi-level buildings or for placement in air handling spaces.