High Quality Material: Wire nut connectors are made of flame retardant material that prevents wires from coming into contact with other wires or exposed metal surfaces, resulting in dangerous faults or short circuits. Easy to Use: Securely connect wires without soldering or electrical tape, spring-loaded insert ensures a stable connection when working on wiring projects, reusable, safe and reliable. Safety Tools: Tough thermoplastic shields can withstand environmental extremes, temperature rated up to 221F (105C). Easy to Store: Our assortment of twist-on wire connectors packed in a divided storage box to keep different wire connectors separately. Convenient for storage and use. Widely Used: The twist on electrical connectors is ideal for home theater, marine wiring projects, home wiring projects, speaker wire, stereo wiring, automotive, home wiring projects, commercial or residential applications, etc. Package Contents: 18 * Yellow 10 * Red 80 * Blue 60 * Gray 52 * Orange