Material: Wire connectors are made of nylon PA66 with high quality flame retardant insulation material, which has the advantages of long life, aging resistance, high pressure resistance, insulation and flame retardant. Save time: Lever-nut connector instead of traditional electrical tape and electrical butt connectors twist-type, technological innovation reduce wiring time by 70%. Convenient and practical: Just lift up the lever, insert the stripped wire, and press the lever closed, holds tight and makes a solid connection. Reusable: These wire connector are suitable for soft and hard wire. Besides, it is a reusable connector. They work with most every gauge of normal household wiring: ceiling fans, sockets, switches, cars, motorcycles, ships, loudspeakers, lamps, electrical boxes, chandeliers, light switches, fan controls, and much more.