The metal clips are made of nickel-plated iron, good electrical conductivity, easy to install. The sleeves are made of high-quality PVC material, high-quality flame retardant, environmentally friendly and non-toxic, safe to use. Comes in total 20 clips, the length of the clip (without sleeve) is 28 mm, can meet your basic needs for daily use. The clips are frequently used in physics labs at school to assemble quickly and cheaply. They are useful for connecting components to wires. Great replacement parts for repairing broken cables on test equipment and chargers or making your own low-voltage jumper cables. Description: These clips are easy to install and safe for use with the covered PVC insulation sleeves. They can be used for electrical testing, repairing broken clips on test equipment and chargers, making your own low-voltage jumper cables. They are also ideal for use in stereo applications or with battery, power terminals or for use on test leads, power, test, battery, multimeter test leads. Specifications: Handle Material: PVC. Clip Material: Nickel Plated Iron. Function: Electrical Testing. Contents: 20 clips.