Wires b connectors used for low voltage, such as telephone, alarm wiring, telecommunication industry, networking, and security (CCTV) systems ect. ^^ Blue Color Coding for Identification. Waterproof for outdoor use, filled with a corrosion resistant silicone gel. ^^ No wire stripping or clean up needed. Non-hardening gel barrier, rugged protective outer covering. ^^ Made of insulation PVC material. Compatible with AWG 18-30 gauge wires ^^ Provided with piercing inner tines for connecting to wires.