... excellent restoring force! we will manufacture your 4P4C modular plug telephone spiral cord to the highest standard, in order to get our ... the core number?do you need any filler in the cord to increase the tensile strength? We have filler of Nylon ... cold, heat, grease, acids, bases, high abrasion, flame retardancy Aplication: telephone handset 4P4C Modular Plug Telephone Spiral Cord