The Easy-Twist ET-CP-14 240-Count Combo Pail of Standard and Winged Wire Connectors includes four key sizes that an installer might need. Contains 65 Orange WC-O, 45 Yellow WC-Y, 30 Red WC-R and 100 Blue WC-B. These twist-on wire connectors are designed for use on copper wires in many different size ranges. They???re made of flame-retardant thermoplastic rated for a maximum temperature of 105?? Celsius (221?? Fahrenheit). The quick-grip square spring design grips in fewer twists and can dead-end a single wire, while the ergonomic ribbed texture make them easy to twist. Their compact design is useful for applications in tight areas or anywhere else you need to connect wires. Manufacture Part Number: ET-CP-14 UPC - 662381143235