Internal serrations allowing for a positive hold onto cable and pipe bundles. The design of the head guarantees a high tensile strength while allowing a very low insertion force. Small Cable Ties Black in UKare flame-retardant, heat-resistant, UV resistant Cable Ties. They are also suitable for using in Computer Cables, network cables, home use, workshop and garden. They are made from UL Approved Polyamide 6.6, 94V-2 material. Kafton UK is one of the leading Cable Ties suppliers in the UK.