... (FRP) locates in the center Loose tube,metallic type,APSP sheath-GYFTA53Description The fibers, 250um, are positioned in a loose tube ... the cable core is covered with a thin Polyethylene (PE) inner sheath, which is filled with jelly to protect it from water ... is applied the cable is completed with a PE outer sheath. ApplicationsØ -.Usable in Duct or AerialØ -.Long-haul communication systems ...