Copper: Both ends of the test leads are pure copper alligator clips. The maximum width of the crocodile clips opening is 10mm. Lead length: 3.3ft. Voltage: 1000V. Current: 15A. Sturdy: The alligator clip is firmly fixed to the wire, and the rubber insulation layer ensures that it will not slip during use. The spring on the crocodile clip is strong enough and will not deform as you use it more often. Function: Suitable for all electrical testing, electronic applications like automotive accessories and testing circuits on your vintage cars, trucks and motorcycle. As long as whatever you are testing uses a fuse of 15A or smaller. Package include: 10PCS alligator clips test leads. 10 colors make it easy to distinguish them during use. Hope you can be satisfied with our products. We will always provide friendly customer service. Goupchn 10PCS Alligator Clips Test Leads Dual Ended Crocodile Wire Cable with Insulators Clips Test Flexible Copper Cable for Electrical Testing 10 Colors 3.3ft/1m