High Quality MaterialAll alligator clips are made of high purity copper and PVC material with good electrical conductivity and nickel plated. The surface is smooth and will not damage the wires. These alligator clips have anti-rust, anti-corrosion and anti-oxidation properties, and are very durable. Product FeaturesSpot welding connected by welding is mainly used for DIY flux . It is a miniature device for gluing parts together and a wire for soldering. It is a good household welding tool and electrical test tool. Multiple ColorsThere are five different wire colors. You can easily view the wiring status and easily identify the measurement results. Safety DesignIt consists of two parts, a metal alligator clip with an insulating cover, which is safe to use and has excellent electrical conductivity. Wide ApplicationThese alligator clips have a wide range of applications, mainly used in multimeters and other home, school and car instruments and gauges . Typically used in school physics labs to quickly assemble circuits.