High quality material: Electrical connectors are made of copper and insulating PVC, with high tensile strength, high quality copper material ensures super conductivity and prevents damage during use, and can be used for a long time.Package includes: 100 piece female and male circular connectors in 5 colors, packed in a transparent box with a compartment corresponding to the color, and 10 pair crimp connectors each in red, blue, yellow, green and black, sufficient to meet your different needs.Easy operation: The electrical connectors are easy to use, and the insulated male and female round connectors can be easily connected to wires, increasing their reliability and safety. Even beginners can use it easily. More reliable than conventional crimp contacts.Widely used: Ball joint connectors are widely used in wire connection devices such as cars, ships, machinery, electricity, household appliances, computers, etc. used. These electrical plugs and sockets are also suitable for electricians, technicians, home users, hobbyists and beginners.