GYFXTZY indoor and outdoor dual-purpose optical cable is a loose sleeve made of high modulus plastic that places optical fibers. Fill with ointment. Wrap another layer of waterproof glass yarn in the casing. The outermost layer is extruded with a layer of polyvinyl chloride (PVC) or Low smoke zero halogen material (LSZH, low smoke, zero halogen, flame retardant) sheath.