Heavy-duty 23AWG insulated wire. Solid bare pure copper conductors for flexibility and less conductor breakage. Conductor separator spine to fight against twists and kinks to reduce crosstalk for a cleaner signal. Rip cord to strip PVC cable jacket. Box contents: 500 Feet cable, 20 RJ45 modular connectors, splicing / crimping tool. Outer Diameter: 5.7 mm.