Construction Conductors: 16, 19, and 22 AWG solid, uncoated copper wires. A thermoplastic compound, color coded per telephone industry standards. Core Assembly: Insulated conductors are twisted into pairs with varying lengths of lay to minimize cross-talk. Pairs are oscillated into cable or units with identifying non hygroscopic binders. Concentric/oscillated construction through 25 pairs and unit construction for larger cables. A non-hygroscopic core tape is applied over the cable core as a dielectric and heat barrier. Shield: A .005€� copper tape is longitudinally applied with an overlap and corrugated to increase flexibility. Jacket: The black jacket is resistant to abrasion, moisture, weather and environmental cracking. It meets the requirements of ICEA S-73-532. The jacket is surface printed with year of manufacture, product description and sequential footage marks at two foot intervals. Specifications Manufactured to ICEA S-56-434. Product Features Color coded to telephone industry requirements. Excellent mechanical and electrical characteristics. 100% shielding. Highly resistant to abrasion, moisture, weather and environmental cracking. Low Smoke, non-halogentated construction.