The Easy-Twist WC-HB1-B 1,000-Count Bag of High Temperature Black Wire Connectors are designed for use on copper wires in the 22-18 AWG size range. They’re made of flame-retardant thermoplastic rated for a maximum temperature of 150˚ Celsius (302˚ Fahrenheit). The quick-grip square spring design grips in fewer twists and can dead-end a single wire, while the ergonomic ribbed texture makes them easy to twist. Their compact design is useful for applications in tight areas or anywhere else you need to connect wires.