One end: 1 male and 1 female roll set.MC4 type connectors (male and female) are attached to one end. Conductor: soft copper wire; Insulation: cross-linked polyethylene; Sheath: non-lead heat-resistant vinyl; Nominal cross-section: 3.5mm2; Configuration: 7 pieces/0.8mm; Finish outer diameter: approx. 6.4mm solar panel cable, extension cable between solar panel and solar panel and connection box, compliant with PSE Electrical Appliance Safety Act.