Standard:bt cw1128/1198 Capacity:50000 coils/week The steel tape armor provides increased mechanical protection and gopher resistance Conductors:solid annealed copper Insulation:dual insulation consisting of an inner layer of foamed polyolefin surrounded by a solid polyolefin skin, color-coded in accordance with telephone industry standards Twisted pairs:insulated conductors are twisted into pairs with varying lay lengths to minimize crosstalk core assembly: 25 pairs and less; pairs are assembled together in a single group More than 25 pairs: pairs are arranged in groups, each group having a color coded unit binder 1200 pairs and larger are mirror image color code. Filling compound: the entire core assembly is completely filled with etpr compound , filling the interstices between the pairs and under the core tape core wrap: dielectric tape applied longitudinally with an overlap shield: corrugated, copolymer-coated, 0.008â??â?? al tape applied longitudinally with an overlap Jacket: black, linear low density polyethylene